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- Title
Segmentation and fishery characteristics of the mixed-species multi-gear Portuguese fleet.
- Authors
Duarte, Rafael; Azevedo, Manuela; Afonso-Dias, Manuel
- Abstract
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.
- Subjects
PORTUGAL; FISHERY management; FISHING equipment; CLUSTER analysis (Statistics); REGRESSION analysis; SPECIES
- Publication
ICES Journal of Marine Science / Journal du Conseil, 2009, Vol 66, Issue 3, p594
- ISSN
1054-3139
- Publication type
Article
- DOI
10.1093/icesjms/fsp019