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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on February 19, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(3):594-606; doi:10.1093/icesjms/fsp019
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Segmentation and fishery characteristics of the mixed-species multi-gear Portuguese fleet

Rafael Duarte1, Manuela Azevedo1 and Manuel Afonso-Dias2

1 Instituto Nacional de Recursos Biológicos, I.P. L-IPIMAR, Avenida de Brasília, 1449-006 Lisboa, Portugal
2 Centro de Investigação Marinha e Ambiental, Universidade do Algarve, 8005-139 Faro, Portugal

Correspondence to R. Duarte: tel: +351 21 302 7000; fax: +351 21 301 5899; e-mail: rduarte{at}ipimar.pt.

Duarte, R., Azevedo, M., and Afonso-Dias, M. 2009. Segmentation and fishery characteristics of the mixed-species multi-gear Portuguese fleet. – ICES Journal of Marine Science, 66: 594–606.

Fleet segmentation and knowledge of fishing fleet dynamics are essential to move from single species to fishery/fleet-based advice. The coastal mixed-species multi-gear Portuguese fleet comprises medium-sized (>12 m) vessels, using a diversity of passive gears, and is economically important. For hake (under a recovery plan) and monkfish (overexploited), it contributes >50% to their total annual landings. Commercial daily landings in 2005 from 271 vessels were analysed by region using non-hierarchical cluster analysis and multivariate regression trees. The cluster analysis allowed the identification of regional fleet segments with a low mixture of species throughout the year. The multivariate regression trees were applied to clusters of vessels with a high mixture of species, to explain weekly landing profiles (species) by vessel technical characteristics, fishing license, and main landing port. The results showed a link between exploited species and geographic location, and in the north between vessel size and depth and an inshore/offshore range. Finally, from the analysis and for the most important species exploited by the Portuguese multi-gear fleet, it was possible to define two or three vessel groups that accounted for at least 50% of the landed value.

Keywords: fleet segmentation, mixed-fisheries management, multi-gear, multispecies, non-hierarchical cluster analysis, regression trees

Received 7 April 2008; accepted 8 December 2008; advance access publication 19 February 2009.


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