Journal Article

A survey-based assessment of the Northeast Arctic cod stock

Knut Korsbrekke, Sigbjørn Mehl, Odd Nakken and Michael Pennington

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 58, issue 4, pages 763-769
Published in print January 2001 | ISSN: 1054-3139
Published online January 2001 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1006/jmsc.2001.1064
A survey-based assessment of the Northeast Arctic cod stock

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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.

Keywords: survey calibration; Northeast Arctic cod; time-series; virtual population analysis

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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