Population dynamics of southern rock lobster in SA waters

Project number: 1993-086
Project Status:
Completed
Budget expenditure: $333,640.53
Principal Investigator: Jim Prescott
Organisation: South Australian Rock Lobster Advisory Council (SARLAC)
Project start/end date: 8 Sep 1993 - 31 Dec 1996
Contact:
FRDC

Objectives

1. To obtain data (catch and effort, tagging, sampling) and analyse it to gain estimates of growth, mortality, catchability, female size at maturity, lenght-weight and movement
2. To develop an age structured population dynamics model of the fishery that will allow discrimination at the zone adn smaller spatial scale
3. To use the model to identify the most important biological parameters so as to give them highest priority
4. To use the model to estimate sustainable yields, predict outcomes of alternative management strategies and understand the interactions of the two management zones
5. To provide an accessible, secure data base of stock information, improved data validation and verification.
6. To provide a graphics interface for the models and ata to facilitate understanding by industry and management
7. To transfer results to industry and other user groups
8. To involve industry in research and educate them about the results and their consequences
9. To obtain preliminary habitat and oceanographic information to assist in determining critical habitats and physical processes controlling rock lobster distribution and abundance.

Final report

Authors: J. Prescott R. McGarvey G. Ferguson M. Lorkin
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 
Final Report • 15.31 MB
1993-086-DLD.pdf

Summary

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of biological and fisheries data; integration of biological and fisheries parameters and data in a computer simulation model of the lobster stock and fishery, and dissemination of the project results and assisting commercial fishers to use the simulation model and other information generated by the project. 

Development and application of AUSTed in the Australian Trawl Industry REFER 93/231.07

Project number: 1993-176
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Mike Dredge
Organisation: Department of Primary Industries (QLD)
Project start/end date: 27 Dec 1996 - 30 Dec 1996
Contact:
FRDC

Objectives

1. Further develop the AUSTed design to maximise prawn catches while further reducing bycatch
2. Develop a manufacturing process for AUSTed in conjunction with commercial engineering and net making firms
3. Develop an extension and liaison process in order to have the fishing industry educated about the nature and extent of the bycatch problem and have industry accept the use of excluding gear

Exchange and analysis of historical Soviet fishery data from the waters around Australia

Project number: 1993-239
Project Status:
Completed
Budget expenditure: $102,871.00
Principal Investigator: Tony Koslow
Organisation: CSIRO Oceans and Atmosphere Hobart
Project start/end date: 29 Dec 1993 - 29 Sep 1999
Contact:
FRDC

Objectives

1. Computerise all fishery data from Soviet research cruies in Australian waters, 1963-1975: species composition by trawl length frequency, maturity, and stomach contensts data.
2. Validate and update species identification for species in instances where the identification os in doubt, based on cruise material
3. Archive the data in the AFZIS database
4. Analyse the data for patterns of distribution and relative abundance for major species

Development of a northern Australian squid fishery

Project number: 1994-017
Project Status:
Completed
Budget expenditure: $154,668.33
Principal Investigator: Malcolm Dunning
Organisation: Department of Primary Industries (QLD)
Project start/end date: 27 Jun 1994 - 30 Jun 2001
Contact:
FRDC

Objectives

1. To document the known distribution and seasonal abundance of squid (loligo spp.) and northern calamary (Sepioteuthis)
2. To investigate species composition, seasonal size composition and basic life history characteristics of existing and potentially commercially important northern Australian squid resources
3. To undertake gear assessment/experimental fishing for squid using jigs under lights, lift nets and purpose designed squid trawls off southern and central Queensland in collaboration with commercial fishers
4. To assess the relative seasonal catch rates of squid at selected locations off southern and central Queensland in collaboration with commercial fishers

Final report

Author: Malcolm Dunning Kate Yeomans Scott McKinnon
Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Project products

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

Final Report • 2000-11-08 • 3.62 MB
1994-017-DLD.pdf

Summary

Squid are an increasing component in the reported byproduct of commercial prawn and finfish trawlers in northern Australian shelf waters and interest has been shown by Queensland and Northern Territory fishers in developing target fisheries for squid using jigs. In general, squid caught on jigs or in lift or other surround nets are of higher quality, larger size and, on overseas markets, fetch a much higher price than squid caught by trawling.

In support of developing squid jig fisheries and to provide management advice, this project aimed to consolidate and enhance our knowledge of their fisheries biology and suitable fishing methods for inshore squid in northern Australian waters.

Keywords: inshore squid, developmental fisheries, jigging, tropical Australia, Loliginidae, Photololigo, Sepioteuthis

Guide • 3.74 MB
1994-017 Field guide to Australian cephalopods.pdf

Summary

The aim of this guide is to help commercial fishers, scientific observers and recreational fishermen to identify the most common cephalopods (cuttlefish, squid and octopus) caught in Australian fisheries. Logbooks kept by commercial and recreational fishers provide essential information for fisheries research and management; however, for the records to be useful the catch must be correctly identified, especially in any developing fishery.

Cephalopods, particularly squid, occur in commercial quantities throughout the Australian Fishing Zone but remain largely under utilized. Squid are highly productive species, and generally live for less than a year. They are caught throughout the year, usually with high catches in spring and summer. High catch rates have been recorded in targeted cephalopod trawl fisheries off northern Australia.

Many of the species treated here have not been described and illustrated in the literature, and until now there has been no shipboard guide to the local Australian cephalopods of commercial importance. However, some of the species are included in other publications, some of which are in the bibliography.

As Australia's cephalopod fisheries develop to the stage where management plans are required, the composition, size and sustainable harvest levels of the stocks must be assessed. Commonwealth-managed fisheries are evaluated on the basis of this information. At present, recorded landings represent only a fraction of the cephalopod catch, as cephalopods taken as bycatch are often discarded at sea or used as bait in other fisheries.

A study of the biological parameters associated with yield optimisation of Moreton bay bugs

Project number: 1994-019
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Clive P. Keenan
Organisation: Department of Primary Industries (QLD)
Project start/end date: 29 Jun 1995 - 30 Jun 1996
Contact:
FRDC

Objectives

1. Estimate biological parameters (growth and natural mortality) required to model optimal size limits for two species of Moreton Bay bug
2. Identify physical evidence of the practice of "scrubbing" ovigerous female bugs, develop expertise in the identification of scrubbed bugs, and model the effects of this practice on yield from the stocks of the two species
3. Determine if a third species is present in the trawl fishery of Mackay and its contribution to bug landings
4. Initiate attaining of population parameters necessary for optimising the harvest of the resource

Review of orange roughy assessment

Project number: 1994-143
Project Status:
Completed
Budget expenditure: $52,000.00
Principal Investigator: Kim Parkinson
Organisation: Australian Fisheries Management Authority (AFMA)
Project start/end date: 25 Sep 1994 - 30 Jun 1995
Contact:
FRDC

Objectives

1. Review estimates of abundance and basic biological parameters (motality rates, growth, stock structure, recruitment viability, proportion of spawners breeding each year) used in assessing orange roughy status in the South East Fishery
2. Review statistical methods used in the 1994 stock assessment
3. Reviewing methods of estimating the risk associated with the 1994 assessment
4. Reviewing means of improving future stock assessment in the light of objectives 1-3

Determination of Australian fisheries statistics 1994-95 to 1996-97

Project number: 1994-146
Project Status:
Completed
Budget expenditure: $120,000.00
Principal Investigator: David Campbell
Organisation: Department of Agriculture, Fisheries and Forestry (DAFF) ABARES
Project start/end date: 29 May 1995 - 30 Jun 1998
Contact:
FRDC

Objectives

1. To develop and maintain a data base of production, value and trade statistics for the Australian fishing industry including aquaculture

Final report

Author: Perry Smith
Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Project products

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

Final Report • 1996-12-24 • 355.63 KB
1994-146-DLD.pdf

Summary

This project was undertaken to maintain and develop the collection of industry production, value of production and trade data. These are the only collated, published source of information on commercial industry catches and are used for a wide range of purposes , including determination of Commonwealth allocations for fisheries research funding, industry levies and for addressing a wide range of the information needs of both Government and industry.

Since the project's commencement in 1995 there has been an increased focus on developing the statistics to better meet the information needs of all users. In February 1997, the Fisheries Research and Development Corporation convened the Australian Fisheries Economic Statistics Workshop in Canberra to review the best means of addressing these needs. At this Workshop there was strong support for the approaches adopted in Australian Fisheries Statistics and the form in which it was published. However, there was agreement on the need to address a number of areas where statistics were either not available or were not of the robustness required.

Report • 1997-01-07 • 2.35 MB
1994-146-PDT.pdf

Summary

To meet the needs of the fishing industry and fisheries managers, policy makers and researchers, ABARE has been publishing detailed production and trade data in Australian Fisheries Statistics since 1991. The estimates of the gross value of production provided in this report are used, for example, to determine Commonwealth, state and territory fisheries research funding arrangements each year.

This publication, the sixth in the series, contains a comprehensive set of data on the volume and value of production from Commonwealth and state fisheries, and the volume and value of Australian fisheries trade, by destination, source and product, for the three years to 1995-96. The report also contains a profile of Commonwealth and state fisheries for 1995-96.

Australian Fisheries Statistics can be used in conjunction with ABARE's major annual statistical bulletin, Australian Commodity Statistics, which provides ahistorical series of production and trade statistics for fisheries and a range of other commodities, and ABARE's quarterly journal, Australian Commodities, in which forecasts for major fisheries commodities are updated throughout the year. Together these three publications provide a comprehensive account of historical trends in, and the outlook for, Australian fisheries. Detailed analysis of selected fisheries is also provided in the annual Australian Fisheries Surveys Report.

The age composition of ling catches

Project number: 1994-148
Project Status:
Completed
Budget expenditure: $47,900.00
Principal Investigator: David Smith
Organisation: Agriculture Victoria
Project start/end date: 19 Nov 1994 - 3 May 1997
Contact:
FRDC

Objectives

1. To refine estimates and provide mortality extimates for ling.
2. To compare the age composition of ling catches from different sectors and determine appropriate sample sizes for productionn ageing.
3. To assess change in mortality rates by comparing the ae composition the age composition of current ling catches with catches taken during the 1980s.
4. To hold a ling stock assessment workshop

Final report

Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Final Report • 2.35 MB
1994-148-DLD.pdf

Summary

Ling (Genypterus blacodes) catches are an increasing component of the South East Fishery. There is increasing pressure to raise the trawl sector TAC for ling and there has been a substantial increase in catch by the non-trawl sector, particularly line, which is currently unregulated. Despite the increasing importance ofling in the SEP, population parameters were poorly understood.
 
Ageing studies were carried out by the Central Ageing Facility to provide a comparison of the current age composition of catches by different sectors and enable a refinement of growth and estimation of mortality rates. The age composition of current and historical trawl catches were compared as a preliminary basis for an evaluation of the impacts of fishing on the population. A workshop, through the SEFSAG process, was convened to undertake a stock assessment ofling using the ageing data, catch statistics and other relevant biological information.
 
The greatest catches of ling are taken in Eastern Sectors A and B, with lesser amounts taken off the west coast of Tasmania and in western Bass Strait. Catch rate data for the period 1986 to 1994 were relatively stable in all areas. However, there were marked differences in the seasonality of catches between areas.
 
Unlike the previous Australian growth study which indicated differences with New Zealand, revised growth curves were consistent with New Zealand studies; and ageing methods and interpretation were identical. The maximum age in Australian samples was 28 years but catches were dominated by 3 to 6 year olds except for catches from the west coast of Tasmania and longline catches which had relatively more old fish. There was a marked decline in the proportion of older fish in recent samples from Eden and Ulladulla and an associated increase in total mortality compared to data from the mid to late 1980s. Results from all years suggested that natural mortality was higher for ages 3-10 (approx 0.3) than for older fish (approx 0.1).
 
Considerable progress was made at the ling workshop. Results indicated that recent mortality rates in the eastern sector of the fishery were high. However, these were not consistent with catch rate data and were considered most likely due to unrepresentative sampling. Comprehensive age and size information if collected during 1995/96 will clarify this. In addition, the proposed 1995/96 age/length data together with the results of the workshop will enable the estimation of current and virgin biomass. 
Subscribe to Wild Catch
View Quicklinks