170 results

Effects of Trawling Subprogram: implementation and assessment of bycatch reduction devices in the Shark Bay and Exmouth Gulf trawl fisheries

Project number: 2000-189
Project Status:
Completed
Budget expenditure: $300,380.00
Principal Investigator: Mervi Kangas
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 5 Sep 2000 - 29 Apr 2005
Contact:
FRDC

Need

There is an urgent need to assess the impact of the planned introduction of BRDs on the databases used to manage these major trawl fisheries during the transition to full BRD usage. The proper evaluation of BRD implementation is often lacking in trawl fisheries. There is an urgent need for the project because the whole fleet, in Shark Bay for one season will tow one net with a BRD and one without. In the Exmouth prawn fishery and Shark Bay Scallop fishery several vessels will tow nets(s) on one side with a BRD and one side without. Without the project the implementation of BRD’s into both nets could be delayed.

Specifically, the changes in gear efficiency and fleet fishing behaviour (ie distribution of fishing effort) need to be quantified and incorporated into the extensive fisheries databases for these three closely managed fisheries. Secondly, the success of these devices in reducing the quantity of bycatch throughout the season, needs to be accurately assessed to provide advice to fishery and marine conservation agencies for ecosystem management purposes. The industry and marine conservation groups require a quantitative assessment of the effect of BRDs on catches of prawns and bycatch to ensure they are showing the desired impact.

For companies to maintain an exemption to export fish species under the Commonwealth Wildlife Protection (Regulation of Exports and Imports) Act 1982, they will need to prove that associated fishing practices are undertaking in a manner that is demonstrably ecologically sustainable. The Draft National Policy on Fisheries By-Catch, developed by the National standing Committee on Fisheries and Aquaculture, was recently adopted by the WA State Minister for Fisheries. Under the Minister's plan, the WA trawl fisheries, has been given a 'Priority A' rating, meaning that a specific By-catch Action Plan is to be completed by the end of 2001. The trawl industry is actively participating in trialing of BRDs to meet the required deadline. An observer program is needed to complement commercial operator records as high nightly catch rates make it difficult for vessel skippers and crew to record detailed information from individual nets.

Objectives

1. To improve the efficiencies of BRDs (grids and fish escape devices) being introduced into the Shark Bay and Exmouth Gulf Trawl fisheries and ensure full implementation of the most appropriate BRD by the whole fleet in each fishery.
2. To assess the effect of implementation of BRDs (grids and fish escape devices) on trawl bycatch and on the relative fishing power of the Shark Bay Prawn and Scallop fleet and the Exmouth Gulf Prawn fleet.

Final report

ISBN: 1-877098-47-7
Author: Mervi Kangas

Towards an assessment of natural and human use impacts on the marine environment of the Abrolhos Islands - Phase 1: Data consolidation and scoping

Project number: 2000-166
Project Status:
Completed
Budget expenditure: $143,898.00
Principal Investigator: Chris F. Chubb
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 29 Dec 2000 - 29 Mar 2004
Contact:
FRDC

Need

The management plan for the Houtman Abrolhos; system (Anon. 1998, section 10) identified a number of objectives. In essence these relate to understanding human-use impacts on the marine environment of the Abrolhos Islands and the evaluation of the effectiveness of present and future management strategies to ensure ecologically sustainable multiple use of Western Australia's first Fish Habitat Protection Area. Also it is important to recognise the more general responsibilities that the state of Western Australia will likely have with respect to the Commonwealth under its Oceans Policy statement and to the ongoing environmental stewardship considerations that the conferring of accreditation by the Marine Stewardship Council on the western rock lobster fishery entails.

Specifically, within the context of the Abrolhos Islands management plan there is a need to quantify the physical impacts of current human activity on Abrolhos marine habitats and subsequently establish a monitoring programme central to the ecologically sustainable management of this unique area. However, in order to determine such impacts and monitoring schemes, a number of preliminary steps need to be taken.

1) There is a need to collate, from diverse sources, existing research information relating to the ecology of the Abrolhos Islands, the effects of natural perturbations and to gather information on the types and effects of previous human use on Abrolhos marine habitats where it is documented. This synthesis of information will perform two functions: the first will be a statement of the current status of environmental impact research at the Abrolhos and the second will be as a background document for use in current deliberations and decision making by the Abrolhos Islands Management Advisory Committee.

2) A small amount of survey (field) work is required to establish precisely the timing and locations where commercial (potting, trawling, handlining, aquaculture) and recreational fishing and diving occurs particularly in relation to environmentally sensitive areas of the Abrolhos This information is not available from existing reporting systems such as log books etc. In addition some survey work is necessary to determine and provide general descriptions/ground truth of the various habitat/community types. The results from this field work will facilitate discussion on the scope of the issues to be assessed and methods to be used in long term monitoring programmes.

3) A workshop of community representatives and technical experts (representatives from AIMS, the universities, etc.) is needed to allow the formulation of a dedicated research/monitoring programme that will take into account issues raised by all stakeholders, and the legislated requirements of state and federal governments in relation to ecologically sustainable management.

Objectives

1. To collate existing research information relating to human use impacts and natural perturbations in Abrolhos marine habitats to provide a detailed overview of the status of current knowledge about the marine ecosystem of the Abrolhos Islands.
2. To conduct limited field work to determine the spatial and temporal distribution of commercial fishing and recreational activities and provide general descriptions/ground truthing of habitat/community types at the Abrolhos as baseline/background data for presentation at the workshop.
3. To conduct a scientific workshop including community representatives and technical experts to determine the objectives and formulate a dedicated research programme to provide quantitative monitoring data for use in the sustainable management of the Abrolhos Islands Fish Habitat Protection Area.

Final report

National application of sustainability indicators for Australian fisheries

Project number: 2000-145
Project Status:
Completed
Budget expenditure: $558,291.15
Principal Investigator: Warrick J. Fletcher
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 29 Jun 2000 - 28 Dec 2008
Contact:
FRDC

Need

The urgency to develop a comprehensive and practical reporting system has increased substantially in recent years. The requirement for assessments include the need for third party Government Auditing that will result from the proposals by Environment Australia (EA) to amend schedule 4 of the Wildlife Protection (REI) Act (1982) along with the imminent introduction of the Environment Protection and Biodiversity Conservation Act in July 2000 and the implementation of the Oceans Policy strategies. There are also requirements within each jurisdiction to meet general government commitments to ESD and particularly when these are explicitly part of their Fisheries Legislation. Finally there are also recent developments associated with industry wanting to either gain market access or provide increased leverage for their products from gaining environmental accreditation. Thus, there are a large number of reasons why assessments need to be completed. There is an even greater need to ensure that the reporting schemes developed are sufficiently comprehensive to restrict the level of duplication.

The Standing Committee on Fisheries and Aquaculture (SCFA) identified the need to actively progress the development of nationally agreed criteria and indicators that would enable fisheries managers to report against all the principles of ecologically sustainable development (ESD). The ESD objective is now explicitly or implicitly part of State and Commonwealth fisheries management legislation. There are a number of components related to ESD within the fisheries context, these include the target species, the ecosystem, social and economic issues and also management arrangements. Not all of these components are of interest or are addressed in each of the identified requirements listed above. Thus, in the assessments required by Environment Australia the only components addressed are the target species, the ecosystem and management arrangements. This is similar to the assessments required under the Marine Stewardship Council. Assessments for ISO 14000 and Codes of Conduct only cover management arrangements. However, to fully meet the commitment to ESD, all components will need to be assessed. Consequently the proposed SCFA process will cover all aspects of ESD. These comprehensive assessments should nonetheless incorporate the aspects required for these other requirements.

The SCFA Working Group has been established to steer the development of ESD criteria and indicators with the support of the SCFA Research Committee, who have developed a system for ESD reporting. The Working Group has agreed on an approach and timetable that would result in a report on the application of nationally agreed criteria and indicators for all Australian fisheries by mid 2001.

The Working Group approach includes 3 key research tasks that support their objectives, which require funding:
1. Application of draft criteria and framework using case studies
2. An SCFA workshop based around the case studies
3. An “Initial National Application” report of the ESD criteria and indicators for Australian fisheries

The urgency to progress this approach was raised at the ESD Stakeholder Workshop that was held in Geelong during March 2000. All stakeholder groups were represented at this workshop and they all recognised that there was a strong need to progress from the current situation to one where reporting on all components of ESD can be completed.

Endorsement was obtained from all sectors for the SCFA approach. There were, however, clear indications that effective consultation and participation from stakeholders were required during the project to ensure that the results will obtain national recognition and support. Consequently, a Reference Group will be established that will include representatives from Environment Australia, Commercial Fisheries, Aquaculture, Recreational fisheries, Indigenous groups, FRDC, Environmental groups and other relevant experts. The Reference Group would work in partnership with the SCFA Working Group to assist in the coordination and exchange of information. It was also suggested that this Reference Group along with selected memebrs of the SCFA Working Group could act as a resource for other relevant ESD projects (e.g. 2000/358).

Finally, the workshop resulted in the development of the appropriate linkages between the members of the SCFA proposal, which is primarily concerned with the development of effective ESD reporting mechanisms, with the proponents of the other ESD projects such as FRDC 2000/358 which is designed to assist industry develop better, more environmentally credible methods of operation. These discussions resulted in the agreement as to how the two projects can benefit each other.

Objectives

1. Facilitate the development and consistent application of practical, nationally agreed criteria and indicators by:
2. Completing a series of case studies implementing the agreed draft SCFA criteria and indicators for ESD reporting.
3. Conducting a workshop including representatives of all stakeholders to summarise the results obtained in other tasks related to the development of indicators for fisheries.
4. Completing a workshop report that contains the best available information on indicators and performance measures that could be used immediately to address the ESD criteria provided by SCFA for each main fishery type.
5. Generating a status report using an “Initial National Application” for sustainability indicators in fisheries including an evaluation section that would identify any further research, development or testing required to ensure a complete set of revised criteria, indicators and performance measures that could be used for all fisheries in all jurisdictions.
6. Complete a final national application report for Australian fisheries.
7. Initiate development of an ESD framework for cross fishery and marine planning issues.

Project products

Environment
PROJECT NUMBER • 2000-139
PROJECT STATUS:
COMPLETED

Quantification of changes in recreational catch and effort on inner Shark Bay snapper species following implementation of responsive management measures

A 12-month creel survey of recreational boat-based fishing in Shark Bay, Western Australia was conducted between May 2001 and April 2002 to estimate the catch of pink snapper. During the survey 431 boat crews were interviewed at public boat ramps of which 414 had been fishing. The information...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
Industry
PROJECT NUMBER • 2000-138
PROJECT STATUS:
COMPLETED

Minimising the cost of future stock monitoring, and assessment of the potential for increased yields from the oceanic snapper, Pagrus auratus, stock off Shark Bay

The investment in this project has resulted in a substantially more extensive set of age composition data than would have otherwise been possible. This in turn has underpinned stock assessment modeling that has provided the basis for determining that the commercial fishery for snapper in Shark...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
SPECIES
Environment
PROJECT NUMBER • 2000-135
PROJECT STATUS:
COMPLETED

Regrowth of pilchard (Sardinops sagax) stocks off southern WA following the mass mortality event of 1998/1999

This project produced time series of estimates of spawning biomass for pilchards in four purse seine management zones in Western Australia, three on the south coast and one on the west coast. The pilchard stocks in Western Australia have recovered strongly since the 1998/99 mass mortality. This...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
SPECIES

Biology and stock assessment of the thickskin (sandbar) shark, Carcharhinus plumbeus, in WA and further refinement of the dusky shark, Carcharhinus obscurus, stock assessment

Project number: 2000-134
Project Status:
Completed
Budget expenditure: $528,470.00
Principal Investigator: Rod Lenanton
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 29 Dec 2000 - 16 Nov 2006
Contact:
FRDC

Need

Presently, no stock assessment for thickskin sharks has been completed in Western Australia. New management arrangements are being proposed for the West Coast Demersal Gillnet and Demersal Longline Fishery, Western Australia’s two Northern shark fisheries and the Commonwealth Tuna and Billfish Fisheries (which could lead to a dramatic increase in longline fishing effort in Western Australia). It is necessary for fisheries managers to have a much better understanding of the catch of thickskin sharks, the status of their stocks and the catch of other long lived carcharhinids, such as the dusky shark, as a basis for future management decisions.

There is also a need for a methodology to be established on which to base future stock assessments for thickskin sharks. The stock assessment process requires a better understanding of the species’ biology in Western Australia than is currently available. With the northern and western fisheries for thickskin sharks separated by a large closed area, studies of stock discrimination and movement are necessary to determine the appropriate geographic scale for management of this species.

Bycatch of (particularly adult) thickskin and dusky sharks by ‘non-shark’ fisheries needs to be quantified and considered in relation to Australia’s international conservation responsibilities. If the exploitation of these species is shown to be unsustainable the future viability of valuable fisheries (eg. Southern and Western Tuna and Billfish) may be threatened, unless this bycatch can be eliminated or minimised.

Objectives

1. Study the biology of thickskin sharks in Western Australian waters, including: (i) Movement patterns(ii) Age and growth(iii) Reproductive biology(iv) Diet(v) Stock Discrimination
2. Determine the level of mortality and exploitation of thickskin, dusky and related oceanic shark species in Western Australian waters by all fishing methods
3. Conduct stock assessments, including risk assessment of management options for thickskin sharks and refine the assessment of the status of the dusky shark stock

Final report

ISBN: 1-877098-75-2
Author: Rod Lenanton
Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Final Report • 2006-02-05 • 5.67 MB
2000-134-DLD.pdf

Summary

The purpose of this project was to collect the biological and fishery information necessary to conduct a stock assessment of the sandbar (known locally as ‘thickskin’) shark, Carcharhinus plumbeus and to improve and update the existing stock assessment for the dusky shark, Carcharhinus obscurus.  Results from this project have already been used by the Western Australian Department of Fisheries to determine appropriate management arrangements for the State’s shark fisheries to ensure the sustainable exploitation of these species.  Results have also assisted the WA target-shark fisheries in conducting Ecologically Sustainable Development (ESD) assessment in order to meet Department of Environment and Heritage ecological assessment requirements for maintaining the fisheries’ export approval.

During the mid to late 1990s, changes in targeting practices of vessels operating in the west coast zone of the temperate WA target-shark fisheries caused rapidly escalating sandbar shark catches.  By 1998, sandbar sharks had overtaken dusky sharks as the primary component of the west coast fishery’s catch and had become the 3rd largest component of the temperate fisheries’ total catch.  At the same time, a demersal longline fishery, targeting sandbar shark off the Pilbara and Kimberley coasts began to develop and sandbar catches also began to increase dramatically in the State’s north.  Given this species’ demonstrated vulnerability to overfishing, a formal assessment of the status of this stock and sustainable levels of exploitation became imperative.

The current project therefore collected the biological and fishery-related data that was necessary for accurate stock assessment and developed assessment models appropriate for this long-lived species.  Extensive sampling was undertaken in the target fisheries, as well as in those fisheries that were identified as having a significant bycatch of sharks.  Additional research was conducted through a series of cruises on board the WA Department of Fisheries research vessels Flinders and Naturaliste.  Commercial sampling involved the collection of operational data from the various fisheries, e.g. fishing locations, dates, set times, depths, gear characteristics, etc., as well as identifying and measuring catches, collection of biological data and samples and tagging large numbers of sharks.  Fishery independent sampling allowed data to be collected from areas in which commercial vessels are prohibited from operating, in areas where commercial fishers choose not to operate and with fishing gear-types in areas where commercial vessels are not permitted to use them.

Previous FRDC funded research into WA’s shark stocks (projects 93/067 and 96/130) focussed on the traditional target species of the State’s temperate target-shark fisheries, i.e. dusky shark, C. obscurus, gummy shark, Mustelus antarcticus, and whiskery shark, Furgaleus macki.  One of the key findings of this previous research was that, whilst the exploitation of dusky sharks in the target fisheries was likely to be sustainable, their sustainability was dependent on a very low level of mortality of older sharks outside the temperate shark fisheries.  Since this research was undertaken, several potential and developing sources of adult dusky shark mortality were identified.  Consequently, the assumption that there was a negligible level of exploitation of older dusky sharks could no longer be relied upon and further advice on the status of this species was required. In addition, it was necessary to update the biological parameters and exploitation rates used in the previous assessment with new data, derived from project 96/130 and the current study.

Characterisation of the inshore fish assemblages of the Pilbara and Kimberley coasts

Project number: 2000-132
Project Status:
Completed
Budget expenditure: $472,686.74
Principal Investigator: Stephen J. Newman
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 5 Sep 2000 - 18 Mar 2005
Contact:
FRDC

Need

Inshore demersal fish stocks in Australia’s north-west face increased exploitation pressure by an ever increasing number of recreational fishers in direct competition with an adjacent commercial fishing industry. There is, therefore, an urgent need to determine the species distribution and the composition of demersal scalefish resources in the inshore region of north-western Australia in waters outward from the shoreline to depths of 30 metres, including the documentation of the abundance and diversity of any significant finfish by-catch of prawn trawlers operating within the region, as a basis for formulating rational management plans for the exploitation of the demersal scalefish resource among user-groups.

The sharing of the inshore demersal fish resource in this region will require careful future management to ensure sustainability and avoid conflict among these user groups. This project will provide baseline information on the species composition and relative abundance of the inshore fishes of Australia’s north-west and identify possible nursery areas of species of commercial and recreational fishing significance which may need protection, possibly as nursery closures, in the future. Furthermore, in order to facilitate sagacious management plans and to safeguard the interests of commercial and recreational fishers, the baseline information on the nearshore fishery resources of the north-west provided by this study can be used to assess the impact of any possible access restrictions that may be imposed in areas nominated as future marine reserve sites in north-western Australia.

Objectives

1. To determine the overall catch of the key species of commercial and recreational fishing significance (that is, the recreational catch, commercial catch and other landed catch).
2. To determine the species composition and relative abundance of the inshore demersal finfish resource from the shoreline outward to a depth of 30 metres along the inner-continental shelf in north-western Australia.
3. To determine the nursery areas of fish species of commercial and recreational significance in the Pilbara and Kimberley regions.

Final report

ISBN: 1-877098-40-X
Author: Stephen Newman
Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

Final Report • 2004-07-02 • 9.95 MB
2000-132-DLD.pdf

Summary

The catches of the main fish species obtained by commercial, recreational and charter boat fishers along the Pilbara and Kimberley coasts have been determined by analysing the Department of Fisheries Western Australian Catch and Effort Database System (CAES), the results of a recreational creel survey and the statutory monthly reports of catch and effort by charter boat operators.

The weight of finfish caught by nearshore and inshore commercial fishers along this coast during 2002 was approximately 590 tonnes. The total annual recreational fishing effort along the coast between Onslow and Broome in 2002 was estimated as 190,000 fisher days, which yielded approximately 320 tonnes of fish. The 111 licensed charter boat operators in the Pilbara and Kimberley undertook 3628 tours in 2002, during which they caught 53 tonnes of fish. Thus, the total catch from all three sources approached 1000 tonnes.

Nearshore, shallow waters on beaches and in mangroves and intertidal pools in three regions along the Pilbara and Kimberley coasts were sampled during the wet and dry periods of two consecutive years. Data derived from the resultant catches were used to determine the ways in which fish species use the different habitat types and how the characteristics of the fish faunas varied with latitude, habitat type and season. 

The fish catches from all habitat types collectively yielded 170 species representing 66 families. Fifty three of these species are fished commercially and recreationally along the Pilbara and Kimberley coasts, and a further 17 fish species are caught solely by recreational fishers. The most abundant species included the blue and king threadfin salmons, salmon-tailed catfish, the blue-spot and large-scale mullets, queenfish, western school whiting, Quoy’s garfish, Moses snapper and estuary rockcod. 

Some species, such as the two threadfin salmons, spend the whole of their life cycle in nearshore, shallow waters, whereas others, such as Moses snapper and estuary rockcod, use those waters solely as a nursery area. Species such as the two threadfin salmons and also whiting species were caught predominantly over bare sand, whereas species such as the large-scale mullet and the nervous shark were obtained mainly from mangroves, and Moses snapper and estuary rockcod were collected almost exclusively from intertidal pools.

The species compositions of the fish assemblages were influenced not only by habitat type, but also by season and region and also apparently the extent of tidal action and thus turbidity. Differences between the compositions in the extreme wet and dry periods found in the region were attributable to emigrations and immigrations of large numbers of particular species at certain times. For example, mature catfish aggregate in nearshore, shallow waters during the wet period. 

This project has synthesised the available data from commercial, recreational and charter boat fisheries with baseline survey data throughout the region.  In order to build on the outcomes of this project a number of priority areas for research in this nearshore zone have been identified.

These priority areas of research include; estimation of biological parameters of key species for the purposes of fisheries management (a list of key species is provided in the Further Development Section of this Report); evaluation and assessment of recreational and aboriginal netting activities in the Pilbara and Kimberley region of north-western Australia; determination of the genetic stock structure of the key species of commercial and recreational fishing significance in the nearshore areas throughout north-western Australia to define the appropriate spatial scale for fisheries management; and refinement of commercial and recreational data collection programs in the Pilbara and Kimberley region of north-western Australia.

Keywords: Tropical, commercial, recreational, nursery habitats, nearshore reefs, estuaries, beaches, intertidal, rockpools.

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