Journal Article

On estimating the age composition of the commercial catch of Northeast Arctic cod from a sample of clusters

Aanes Sondre and Michael Pennington

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 60, issue 2, pages 297-303
Published in print January 2003 | ISSN: 1054-3139
Published online January 2003 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/S1054-3139(03)00008-0
On estimating the age composition of the commercial catch of Northeast Arctic cod from a sample of clusters

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Assessment of Northeast Arctic cod is based on estimates of the commercial catch in numbers at age. The age structure of the catch is estimated by sampling fish from commercial fishing trips. Although it is commonly assumed that a sample of individuals is a random sample from the population, fish sampled from the same trip (i.e. from a “cluster” of fish) tend to be more similar in age than those in the total catch. For Northeast Arctic cod, the intracluster correlation for age is positive, and therefore the effective sample size is much smaller than the number of fish aged. Given the number of fish aged, the precision of the estimated age distribution is rather low, and the number of fish aged from each trip could be reduced from approximately 85 to 20 without a significant loss in precision.

Keywords: age distribution; cluster sampling; effective sample size; intracluster correlation

Journal Article.  3241 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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