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Semi-pelagic Longline and Trammel Net Elasmobranch Catches in Southern Portugal: Catch Composition, Catch Rates and Discards
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Autores
Coelho, Rui
Erzini, K
Bentes, Luis
Orientador(es)
Resumo(s)
In Portugal, elasmobranch landings have decreased substantially in recent years. In this work,
elasmobranch catches in semi-pelagic longlines (1997 and 1998) were compared with those in trammel
nets (2000) in the Algarve, southern Portugal areas. In the semi-pelagic longline fi shery, 7 elasmobranch
species represented 33.4% (2 185 specimens) of the total fi sh catches. Among the elasmobranch species,
the most abundant were Galeus melastomus (63.3%), Etmopterus pusillus (21.7%) and Scyliorhinus
canicula (14.2%). Most of these elasmobranchs were discarded (68.3% in total). In the trammel net
fi shery, 16 different elasmobranch species represented 4.3% (597 specimens) of total fi sh catches and
the most important species were Raja undulata (43.6%) and S. canicula (10.2%). The majority of
the elasmobranchs caught in trammel nets had commercial value, and only 5.4% were discarded. In
both fi sheries, intra-specifi c catch rates varied with depth. Length-frequency distributions for the only
species with relatively high catches in both fi sheries, S. canicula, showed that, in general, trammel
nets catch larger specimens and in a narrower length range than do longlines.
Descrição
Palavras-chave
Catch composition Catch rate Discard Longline Portugal Trammel net
Contexto Educativo
Citação
Editora
Northwest Atlantic Fisheries Organization