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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on January 8, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(2):218-233; doi:10.1093/icesjms/fsl024
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Compositional analysis of catch curve data, with an application to Sebastes maliger

Jon T. Schnute and Rowan Haigh

Fisheries and Oceans Canada, Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, British Columbia, Canada V9T 6N7

Correspondence to J. T. Schnute: tel: +1 250 756 7146; fax: +1 250 756 7053; e-mail: schnutej{at}pac.dfo-mpo.gc.ca

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

Received 9 December 2005; accepted 5 October 2006; advance access publication 8 January 2007.


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