A survey-based assessment of the Northeast Arctic cod stock
Acoustic and bottom trawl surveys of the Northeast Arctic cod stock provide fishery independent estimates of abundance and population characteristics. Given the recent uncertainties in the catch based assessment of the stock, survey based abundance estimates of ages 5+ cod and spawning stock biomass...
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Oxford University Press
2001
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fthighwire:oai:open-archive.highwire.org:icesjms:58/4/763 2023-05-15T14:30:23+02:00 A survey-based assessment of the Northeast Arctic cod stock Korsbrekke, Knut Mehl, Sigbjørn Nakken, Odd Pennington, Michael 2001-01-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/58/4/763 https://doi.org/10.1006/jmsc.2001.1064 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/58/4/763 http://dx.doi.org/10.1006/jmsc.2001.1064 Copyright (C) 2001, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Regular Articles TEXT 2001 fthighwire https://doi.org/10.1006/jmsc.2001.1064 2013-05-27T04:12:05Z Acoustic and bottom trawl surveys of the Northeast Arctic cod stock provide fishery independent estimates of abundance and population characteristics. Given the recent uncertainties in the catch based assessment of the stock, survey based abundance estimates of ages 5+ cod and spawning stock biomass, generated by calibrating survey indices with converged estimates from a virtual population analysis (VPA), were compared with the estimates from the annual assessments. The results indicate that the survey-based estimates were more accurate than the estimates from the annual assessments. Since the VPA abundance estimates for younger cod tend to be inaccurate, the amount of information contained in the surveys was tested indirectly by determining how well estimates based on previous survey indices could predict the following year's survey value. A time-series model of ages 3+ cod and haddock survey indices predicted the subsequent value of the cod survey index fairly accurately. It is concluded that it is likely that these fishery independent surveys are providing a more accurate assessment of the current size of the cod stock than the assessment based on combining the survey data with commercial catch statistics. Text Arctic cod Arctic Northeast Arctic cod HighWire Press (Stanford University) Arctic ICES Journal of Marine Science 58 4 763 769 |
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HighWire Press (Stanford University) |
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fthighwire |
language |
English |
topic |
Regular Articles |
spellingShingle |
Regular Articles Korsbrekke, Knut Mehl, Sigbjørn Nakken, Odd Pennington, Michael A survey-based assessment of the Northeast Arctic cod stock |
topic_facet |
Regular Articles |
description |
Acoustic and bottom trawl surveys of the Northeast Arctic cod stock provide fishery independent estimates of abundance and population characteristics. Given the recent uncertainties in the catch based assessment of the stock, survey based abundance estimates of ages 5+ cod and spawning stock biomass, generated by calibrating survey indices with converged estimates from a virtual population analysis (VPA), were compared with the estimates from the annual assessments. The results indicate that the survey-based estimates were more accurate than the estimates from the annual assessments. Since the VPA abundance estimates for younger cod tend to be inaccurate, the amount of information contained in the surveys was tested indirectly by determining how well estimates based on previous survey indices could predict the following year's survey value. A time-series model of ages 3+ cod and haddock survey indices predicted the subsequent value of the cod survey index fairly accurately. It is concluded that it is likely that these fishery independent surveys are providing a more accurate assessment of the current size of the cod stock than the assessment based on combining the survey data with commercial catch statistics. |
format |
Text |
author |
Korsbrekke, Knut Mehl, Sigbjørn Nakken, Odd Pennington, Michael |
author_facet |
Korsbrekke, Knut Mehl, Sigbjørn Nakken, Odd Pennington, Michael |
author_sort |
Korsbrekke, Knut |
title |
A survey-based assessment of the Northeast Arctic cod stock |
title_short |
A survey-based assessment of the Northeast Arctic cod stock |
title_full |
A survey-based assessment of the Northeast Arctic cod stock |
title_fullStr |
A survey-based assessment of the Northeast Arctic cod stock |
title_full_unstemmed |
A survey-based assessment of the Northeast Arctic cod stock |
title_sort |
survey-based assessment of the northeast arctic cod stock |
publisher |
Oxford University Press |
publishDate |
2001 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/58/4/763 https://doi.org/10.1006/jmsc.2001.1064 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Northeast Arctic cod |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/58/4/763 http://dx.doi.org/10.1006/jmsc.2001.1064 |
op_rights |
Copyright (C) 2001, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1006/jmsc.2001.1064 |
container_title |
ICES Journal of Marine Science |
container_volume |
58 |
container_issue |
4 |
container_start_page |
763 |
op_container_end_page |
769 |
_version_ |
1766304234392780800 |