Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/2491
Título: Size selectivity of the Spisula solida dredge in relation to tooth spacing and mesh size
Autor: Gaspar, M. B.
Leitao, F.
Santos, M. N.
Sobral, M.
Chícharo, Luís
Chícharo, Alexandra
Monteiro, C. C.
Palavras-chave: Spisula solida
Size selectivity
Tooth spacing
Mesh size
Data: 2003
Editora: Elsevier
Citação: Gaspar, M. B.; Leitao, F.; Santos, M. N.; Sobral, M.; Chicharo, L. M. Z.; Chicharo, A.; Monteiro, C. C. Size selectivity of the Spisula solida dredge in relation to tooth spacing and mesh size, Fisheries Research, 60, 2-3, 561-568, 2003.
Resumo: A study was undertaken on the northwestern coast of Portugal to evaluate the selectivity effect of both tooth spacing and mesh size on the catch of the white clam (Spisula solida). Two typical clam dredges, equipped with different tooth spacing and mesh size, were towed side by side. Three tooth spacing (20, 40 and 60 mm) and three mesh sizes (35, 40 and 50 mm) were investigated. The dredge selectivity experiments were performed by attaching a cover bag with a 20mm mesh to the gear. Individual hauls were analysed by the SELECT model. The Fryer’s mixed model of between-haul variation was also applied to data. The results showed that the space between teeth does not have an effect on selectivity. Tooth length was directly related to the dredge’s capture efficiency. The only factor that contributed to dredge size selection was mesh size. The 50% retention lengths estimated for mesh sizes 30, 40 and 50mm were 25.68, 26.35 and 31.94 mm, respectively. For all mesh sizes, very narrow selection ranges were observed. The most appropriate mesh size to be enforced within the Portuguese northwestern S. solida fishery should be 40 mm.
Peer review: yes
URI: http://hdl.handle.net/10400.1/2491
ISSN: 0165-7836
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