Journal Article

Compositional analysis of catch curve data, with an application to <i>Sebastes maliger</i>

Jon T. Schnute and Rowan Haigh

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 64, issue 2, pages 218-233
Published in print March 2007 | ISSN: 1054-3139
Published online January 2007 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1093/icesjms/fsl024
Compositional analysis of catch curve data, with an application to Sebastes maliger

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Schnute, J. T. and Haigh, R. 2007. Compositional analysis of catch curve data, with an application to Sebastes maliger. – ICES Journal of Marine Science, 64: 218–233.

This paper applies modern compositional analysis to catch curve data from a quillback rockfish (Sebastes maliger) population in British Columbia, Canada. Bubble plots and ternary diagrams portray variable age distributions and highlight distinctions between commercial and survey sample data. The models formalize important historical issues in catch curve analysis related to selectivity and recruitment variability, where a particular model corresponds to a prescribed vector of design parameters. The roles that compositional distributions (multinomial, Dirichlet, logistic-normal) can play in fishery data analysis are described, and Bayesian methods are used to examine how the distribution of a key mortality parameter depends on model choice. The framework provides a direct link between model designs and policy outcomes that depend on estimated mortalities or mortality ratios.

Keywords: age composition; catch curve; compositional analysis; Dirichlet distribution; logistic-normal distribution; mortality; quillback rockfish

Journal Article.  9854 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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