Modelling discard ogives from Irish demersal fisheries

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 fa...

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Bibliographic Details
Published in:ICES journal of marine science 2006, Vol.63 (6), p.1086-1095
Main Authors: Borges, Lisa, Zuur, Alain F., Rogan, Emer, Officer, Rick
Format: Article
Language:English
Subjects:
demersal fisheries
discard ogives
gadoids
GAM
haddock
Marine
megrim
plaice
sea
whiting
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Summary: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.
ISSN:1054-3139
1095-9289
DOI:10.1016/j.icesjms.2006.03.017