© 2006 International Council for the Exploration of the Sea
Modelling discard ogives from Irish demersal fisheries
a Aquaculture and Fisheries Development Centre, Department of Zoology, Ecology and Plant Science, University College Cork Distillery Fields, North Mall, Cork, Ireland
b Highland Statistics Ltd. Newburgh, Scotland, UK
c Southern Fisheries Centre, Department of Primary Industries and Fisheries PO Box 76, Deception Bay, Queensland 4508, Australia
*Correspondence to L. Borges: Netherlands Institute for Fisheries Research, PO Box 68, 1970 AB IJmuiden, The Netherlands; tel: +31 255 564646; fax: +31 255 564644. e-mail: lisa.borges{at}wur.nl.
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
Received 1 April 2005; accepted 29 March 2006.
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