Journal Article

Modelling discard ogives from Irish demersal fisheries

Lisa Borges, Alain F. Zuur, Emer Rogan and Rick Officer

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 63, issue 6, pages 1086-1095
Published in print January 2006 | ISSN: 1054-3139
Published online January 2006 | e-ISSN: 1095-9289 | DOI:
Modelling discard ogives from Irish demersal fisheries

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Annual discard ogives were estimated using generalized additive models (GAMs) for four demersal fish species: whiting, haddock, megrim, and plaice. The analysis was based on data collected on board commercial vessels and at Irish fishing ports from 1995 to 2003. For all species the most important factors influencing annual discard ogives were fleet (combination of gear, fishing ground, and targeted species), mean length of the catch and year, and, for megrim, also minimum landing size. The length at which fish are discarded has increased since 2000 for haddock, whiting, and plaice. In contrast, discarded length has decreased for megrim, accompanying a reduction in minimum landing size in 2000.

Keywords: demersal fisheries; discard ogives; GAM; haddock; megrim; plaice; whiting

Journal Article.  4362 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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