Using commercial and recreational fisher knowledge to reconstruct historical catch rates for Queensland Snapper (Chrysophrys auratus), Spanish Mackerel (Scomberomorus commerson) and Coral Trout (Plectropomus spp.): long-term data for incorporation into future stock assessments
It is acknowledged that there is a lack of information on past fisheries (i.e. catch rates, fishing effort, proportion of recorded landings) throughout Queensland prior to the start of individual logbook records in 1988 (Halliday and Robins 2007). Yet information prior to this period is critical for successful management, as longer-term perspectives provide data that can help reduce uncertainty associated with projected historical catch levels (Campbell et al. 2009). Long-term data also informs past fishery states, thus equipping managers, stock assessment modellers and the fishing industry with knowledge of historical fishery trends. This can then be used to facilitate informed discussion of appropriate management methods into the future.
During a review of the 2008 Queensland snapper stock assessment, Francis (2009) called for consultation of ‘knowledgeable people’ in order to reconstruct past catch histories, thereby improving estimates for future stock assessments. We aim to fill this gap in research for two fish species that are of particular economic, social and cultural importance to Queensland, pink snapper (Pagrus auratus) and Spanish mackerel (Scomberomorus commerson), through the collation and synthesis of commercial and recreational fisher knowledge.
Our project has broad application to the FRDC’s Research Plan, as it provides a long-term view of the use and management of aquatic resources. It applies to the National Fishing and Aquaculture RD&E Strategy, as it will gather knowledge that can inform environmentally sustainable fishing through determining past changes to catch rates, locations fished and relative fishing effort. In addition, perceptions of changes to fisheries and the broader ecosystem as a result of non-fishery drivers, i.e. coastal development, resource management measures and social drivers of change, will be gathered. Our proposed research will focus upon commercial and recreational fishers, thus incorporating the two major sectors involved in wild-catch fisheries.
Final report
The influence of fish movement on regional fishery production and stock structure for South Australia's Snapper (Chrysophrys auratus) fishery
Developing a comprehensive understanding of the movement patterns and stock structure of a fish species is crucial for identifying the appropriate scale and strategy for management.
In south eastern Australia, there are several adjacent Snapper fisheries operating in South Australian (SA), Victorian and Commonwealth waters that are managed using different strategies. The SA fishery, currently Australia’s largest Snapper fishery, is divided into contiguous regions whose relative contributions to total catch have changed dramatically in recent years. The extent to which these different regional or jurisdictional populations represent a single or multiple stocks is poorly understood because of the limited understanding of the patterns of fish movement. For example, have the recent high catches of Snapper from Northern Gulf St. Vincent and South East resulted from high levels of biomass built up through local demographic processes or have fish moved in from adjacent regions or possibly even from Victorian or Commonwealth waters? If large-scale movement is involved, it must be temporally complex as it appears to not conform to a regular, annual pattern. The need here is to elucidate the regions of origin and movement patterns of fish that currently contribute to high regional catches in SA to inform about the demographic processes that drive the spatial and temporal variation in fishery productivity. This will point to the appropriate spatial scale for management. It would also provide insight for resource allocation amongst the different fisheries, which is currently being considered by AFMF to improve resource sharing arrangements for Snapper.
Revolutionising fish ageing: Using Near Infrared Spectroscopy to Age Fish
Estimates of the age structure of fish populations are central to assessing the status of fished stocks, evaluating management strategies and the impact of fishing. Determining fish age is usually done by counting growth checks in fish otoliths. This is generally a laborious, time-consuming process involving considerable preparation of the otoliths (resin-embedding, cutting and polishing) prior to ring-counting. This proposal aims to develop and validate a rapid innovative method for ageing fish based on an analysis of otoliths by NIRS. With increasing costs and, in some jurisdictions, diminishing R&D budgets, collection and ageing of representative fish samples becomes increasingly difficult. If NIRS is as efficient at determining fish age as the preliminary study suggests, it will be a breakthrough of global significance.
Commonwealth and State legislation requires that fishery resources be managed sustainably. Age-based stock assessment methods are one of the most informative tools available for assessing Australia’s fisheries. The collection of otoliths from recreational and commercial catches is undertaken across a wide range of fisheries as part of fishery monitoring and assessment programs.
This proposal addresses the need and QFRAB priority for:
• Developing innovative tools and technologies for managing Australian fisheries
• Developing more efficient, cost-effective ways of obtaining the information needed to undertake age-based fishery assessments
• More reliable fishery assessments by improving the availability and quality of age information from fish population samples
Final report
Results from the current ‘proof of concept’ study indicate that near infrared (NIR) spectra collected from fish otoliths have potential to estimate the age of Barramundi (Lates calcarifer) and Snapper (Pagrus auratus), with performance varying between species and locality of capture. A case study of hypothetical running costs suggest significant cost savings could be achieved if NIRS is used to supplement standard fish ageing methods. However, there is considerable time (i.e., at least 3 years) and start-up costs to develop and validate NIRS calibration models for fish age to a point where only model maintenance is required (i.e., running costs). Results also indicate that NIRS may be particularly useful for spatial (e.g. stock) discrimination. The potential applicability of NIRS was recognised by end-user
stakeholders in Queensland and the Northern Territory, who are proposing further research work.
Understanding what NIRS measures in fish otoliths and how this is correlated with age (or geographic location) was a common desire of fisheries end-users in all jurisdictions, because this knowledge could reduce error and would significantly enhance the applicability of NIRS technology in fisheries science.
FRDC-DCCEE: preparing fisheries for climate change: identifying adaptation options for four key fisheries in South Eastern Australia
A project to inform fisheries adaptation to climate change is needed in the South East region because:
1) it is an international ‘hotspot’ for marine climate change, which is currently displaying signs of perturbation and where further shifts, shrinkages and expansions of ecosystems and species distributions are expected;
2) it produces >50% of Australia’s seafood and is home to 60% of the Australian population;
3) a formal risk assessment identified fisheries species at highest risk from climate changes are also those with highest economic importance to the region;
4) its fisheries are managed by five separate jurisdictions whose adaption responses will need to be well coordinated if negative impacts are to be reduced effectively and opportunities that arise are to be seized.
Final report
Impact of management changes on the viability of Indigenous commercial fishers and the flow on effects to their communities: case study in NSW
Indigenous commercial fishers* (ICF) make up a small percentage of commercial fishers in NSW. They are usually small operators that;
(i) derive a personal income, and
(ii) many cases, supply some catch for local indigenous community consumption.
The NSW Indigenous Fisheries Strategy 2002 emphasized the importance of indigenous participation in the commercial fishing sector. A workshop conducted with ICF in 2003 identified obstacles to ongoing and future participation in the sector. Several issues were identified see 'A Draft Discussion Document and Action Plan. Developing the participation of Indigenous people in commercial fishing. A Report commissioned by NSW Fisheries '. One of the main issues identified was;
'The gradual and continuing decline of Aboriginal commercial fishers in the industry means loss of an accessible and appealing employment base for Aboriginal communities'.
To date little has been done to address the decline and recent communication with some ICF, particularly in far northern NSW, indicate that it is continuing. ICF indicate that ongoing changes to management approaches in NSW are making it even more difficult for them to stay now then previously.
There is an urgent need to analyse the possible impacts of new management changes (structural readjustment in NSW - see the Pyrmont Pact) on indigenous participation in commercial fisheries and to develop revised strategies that seek to maintain the existing levels and where possible increase indigenous involvement in commercial fisheries so as to address (i) and (ii) above.
*Here we are talking about indigenous participation in commercial fisheries, not cultural fisheries.
Final report
Tactical Research Fund: Developing a dynamic regional brand - focus on flavour
The Eyre Peninsula seafood industry formed Brand Eyre Peninsula in 2006, a collaborative market development program aimed to increase sales and market position in the domestic and export market. Integral to the brand is the education of the species’ attributes to all key stakeholders of the value chain including seafood wholesalers, retailers, food service and media. The results of market development initiatives have been communicated to the owner, head buyer or executive chef of businesses, however, the program failed to support training for key staff such as restaurant front of house and retail counter staff. There is a need for a simple, cost effective training tool due to the high turnover of these positions.
Australian and export clients have consistently requested a “Seafood Flavour Wheel” to assist in menu planning and tasting notes for chefs and sommeliers. Once developed, this tool would be distributed to an initial 500 existing clients to support immediate industry and consumer education. The development of the “Seafood Flavour Wheel” has an extensive level of support from its current client base.
The proposed “Seafood Flavour Wheel” will be a training guide benchmark and has the potential to expand to an Australian guide, inclusive of all seafood species. Specifically, the development of the Eyre Peninsula “Seafood Flavour Wheel” will assist the lack of knowledge and appreciation for the flavours of a target group of seafood species specific to that region.
Equipped with this knowledge, a united industry marketing approach will effectively connect customers with an experience of the unique regional flavour qualities of Eyre Peninsula’s premium seafood. Through this experience, customers will learn to recognise the sensory attributes of Eyre Peninsula seafood and distinguish these products from those originating from other Australian and international regions.
Final report
Passive acoustic techniques to monitor aggregations of sound producing fish species
Determination of the diets of Snapper and Silver Trevally and construction of a food web for the demersal fish community in south-western Australia
Implementation of ecosystem-based fishery management requires sound knowledge of food webs if the indirect effects of fishing on trophic structure are to be understood. There is an urgent need to construct a quantitative food web so that we can understand the ways in which the marked declines in the abundances of important fish species off the lower west coast of Australia, which led to the recent closure of the metropolitan commercial fishery, are likely to have impacted on the ecosystem. While there are sound dietary data for most of the more abundant and important species in this region, no such data are available for Snapper (Pagrus auratus) and Silver Trevally (Pseudocaranx dentex). Snapper was a primary target species for commercial fishers, and Snapper and Silver Trevally both continue to be of great importance to recreational fishers. Sound dietary data for these species, which take into account the ways in which their diets change with body size and season, are essential for the construction of a reliable food web. There is a need to combine the new dietary data for these species with those that were collated in the database developed in FRDC 2002/016 and with the results from more recent studies, converting them into common dietary categories, size categories and a common format before they can be used to construct a reliable food web. The opportunity exists, while Ian Potter remains actively involved in research, to apply the experience and knowledge that he and Margaret Platell possess (noting that these two biologists have been involved in collecting much of the available dietary data for the demersal fish species of south-western Australia) to bring together the results of approximately 15 years of research to create a food web for this region that will be invaluable for future research and management.