76 results
Environment
PROJECT NUMBER • 1993-238
PROJECT STATUS:
COMPLETED

Evaluation of harvesting strategies for Australian fisheries at different levels of risk from economic collapse

Management of a marine renewable resource involves selecting a trade-off between conflicting objectives related to conservation and utilization. This problem is complicated by uncertainty about the current status and productivity of the resource being managed, and hence about the implications of...
ORGANISATION:
CSIRO Oceans and Atmosphere Cleveland
TAGS
Sustainability
Stock Assessment
Reproduction
Modelling
Individual Transferable Quota
Environment
Environment
PROJECT NUMBER • 1991-032
PROJECT STATUS:
COMPLETED

A comparison of otolith microchemistry and genetic techniques for evaluation of stock structure of the jackass morwong Nemadactylus macropterus

Four different techniques for determining the stock structure of a marine fish species were compared, using as a subject the jackass morwong. The four techniques examined were allozyme analysis, mitochondrial DNA analysis and two techniques based on measuring the composition of otoliths ('ear...
ORGANISATION:
CSIRO Oceans and Atmosphere Cleveland
TAGS
Stock Assessment
Population Dynamics
Fisheries Management
Distribution
Environment
PROJECT NUMBER • 1989-030
PROJECT STATUS:
COMPLETED

Age determination and assessment of variation in length at age of large southern bluefin tuna by means of otolith and vertebral chemical composition

Patterns of ontogenetic variation in the composition of the otoliths of southern Bluefin tuna (SBT), Thunnus maccoyii, strongly suggested that the concentrations f some elements (and particularly strontium) varied episodically, and probably annually. This suggested that counting the numbers of peaks...
ORGANISATION:
CSIRO Oceans and Atmosphere Cleveland
Environment
PROJECT NUMBER • 1983-048
PROJECT STATUS:
COMPLETED

Stock identity of northern fish species

The research program supported by this grant was directed at determining the number and distribution of subpopulations or genetic stocks which contribute to Australian fisheries for barramundi, northern sharks, and narrow-barred Spanish mackerel. Starch gel electrophoresis was used to reveal...
ORGANISATION:
CSIRO Oceans and Atmosphere Cleveland
TAGS
Stock Assessment
Population Dynamics
Laboratory Procedures
Husbandry
Distribution
People
PROJECT NUMBER • 1983-067
PROJECT STATUS:
COMPLETED

Second Australian National Prawn Seminar

Since the First Australian National Prawn Seminar in 1973, Australian prawn fisheries have grown in size and value to become Australia's most valuable fisheries resource. In the same period the number of people involved in the fishing industry, research and management has also increased. Major new...
ORGANISATION:
CSIRO Oceans and Atmosphere Cleveland
TAGS
Tagging
Stock Assessment
Reproduction
Migration
Marketing
Environment
PROJECT NUMBER • 1986-087
PROJECT STATUS:
COMPLETED

Northern shark tagging study

In 1982, CSIRO applied to the Fishing Industry Research Trust Account for funding of a joint biological investigation of northern Australian pelagic fish stocks. At that time these stocks supported a Taiwanese surface gill-net fishery based on sharks, tunas and Spanish mackerel. During the 1970's...
ORGANISATION:
CSIRO Oceans and Atmosphere Cleveland
TAGS
Tagging
Stock Assessment
Reproduction
Population Dynamics
Physiology
Environment
PROJECT NUMBER • 1983-049
PROJECT STATUS:
COMPLETED

Northern pelagic fish stock research

In 1982, CSIRO applied to the Fishing Industry Research Trust Account for funding of a joint biological investigation of northern Australian pelagic fish stocks. At that time these stocks supported a Taiwanese surface gill-net fishery based on sharks, tunas and Spanish mackerel. During the 1970's...
ORGANISATION:
CSIRO Oceans and Atmosphere Cleveland
TAGS
Tagging
Stock Assessment
Reproduction
Population Dynamics
Mortality

Interim monitoring of the 1995 eastern gemfish spawning run

Project number: 1995-039
Project Status:
Completed
Budget expenditure: $23,174.00
Principal Investigator: Ronald E. Thresher
Organisation: CSIRO Oceans and Atmosphere Cleveland
Project start/end date: 16 Aug 1995 - 29 Oct 1996
Contact:
FRDC
TAGS
Workshop
Stock Assessment
Reproduction
Market Opportunities
Fishing Effort

Objectives

1. To ensure continuity of monitoring gemfish recruitment in order to obtain better information on possible effects of environmental variability and overfishing on the stock

Final report

Author: Ron Thresher and Derek Staples
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
Final Report • 1996-03-06 • 1.68 MB
1995-039-DLD.pdf

Summary

Historically, monitoring of the eastern gemfish stock has been based on sampling at NSW fish markets, and carried out by NSW Fisheries Research Institute as part of its NSWs management responsibilities for the fishery. With the advent of AFMA, however, responsibility for monitoring of the fishery passed to the commonwealth, and its implementation has not been put on a firm footing. The need for continued monitoring of the fishery and the stock is particularly critical given the recent collapse of the fishery, at best qualitative indices of whether or not the condition of the stock is improving as a result of the closure, and continuing uncertainty about the future of the stock or the fishery. As a result of the uncertain plans by AFMA for monitoring the current gemfish by-catch, SETMAC recommended that a proposal be developed for submission to the FRDC to support an interim by-catch monitoring program for the 1995 spawning run, while longer term arrangements for monitoring the state of the stock could be developed.
 
Following a successful application, NSW FRI was contracted to continue its monitoring of the gemfish fishery and stock, as indicated by by-catch. The monitoring was completed as planned, based on on-board sampling, port sampling and market sampling. Data and samples collected include catch numbers, length frequencies and otoliths for age analysis.
 
The data indicate a continuing decline in the number of large, older fish in the stock. The by-catch is dominated by juveniles and small. adults from the 1990 and 1991 year-classes. The 1992 year-class continues to look weak, whereas 1993 appears to have produced a much stronger year-class. Interpretation of the relative sizes of the peaks in the length frequency data is difficult, however, due to uncertain effects of sampling biases.
 
These data have been provided to industry at meetings of the Eastern Gemfish By-catch Working Group, the Gemfish Stock Assessment Group and the Eastern Gemfish Workshop. The data were also provided to scientists doing the gemfish stock assessment and evaluating harvest strategies for Australian fisheries at the risk of economic collapse.
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