Size selectivity of diamond and square mesh codends for hairfin anchovy Setipinna taty in Chinese stow net fisheries

Selectivity experiments of diamond and square mesh codends with different mesh size (30, 35, 40 and 45 mm) for hairfin anchovy Setipinna taty were carried out using the covered codend method in Chinese stow net fisheries. In the present study, 5151 specimens were subsampled and asymmetric and symmet...

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Bibliographic Details
Published in:	Fisheries science Vol. 72; no. 3; pp. 530 - 539
Main Authors:	Sun, M.C.(Shanghai Fisheries Univ. (China)), Zhang, J, Xu, L.X
Format:	Journal Article
Language:	English
Published:	Melbourne, Australia Blackwell Publishing Asia 01-06-2006 Springer Nature B.V
Subjects:	BODY MEASUREMENTS DESEMPENO DE LA MAQUINARIA diamond mesh EQUIPMENT PERFORMANCE FILET DE PECHE Fisheries FISHING NETS hairfin anchovy Setipinna taty Marine Maximum likelihood method MEDICION DEL CUERPO MENSURATION CORPORELLE minimum mesh size NET FISHING PECHE AU FILET PERFORMANCE DU MATERIEL PESCA CON RED REDES DE PESCA SETIPINNA TATY size selectivity square mesh stow net Studies Temperature China
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Summary:	Selectivity experiments of diamond and square mesh codends with different mesh size (30, 35, 40 and 45 mm) for hairfin anchovy Setipinna taty were carried out using the covered codend method in Chinese stow net fisheries. In the present study, 5151 specimens were subsampled and asymmetric and symmetric selectivity curves (Richards and Logistic curves) were fitted to the catch data, using the maximum likelihood method according to the SELECT model. The results show that the Richards curve gives a better fit to the selectivity curve for diamond mesh codends with 30, 35 and 40‐mm mesh sizes, whereas the logistic curve gives a better fit for the diamond mesh codend with 45 mm mesh size and square mesh codends with 30, 35, 40 and 45‐mm mesh size. With the exception of 45‐mm mesh size codends, the L50 of diamond mesh codends were insignificantly larger than those of square mesh codends. However, the selectivity curves of square mesh codends were steeper than those of diamond mesh codends, except the 30‐mm mesh size codends. As for diamond mesh codends, according to the linear relationship between the L50 and mesh size, 36.5‐mm mesh size codends could release 50% juvenile hairfin anchovy (below 1‐year old). However, diamond mesh codends with such a mesh size are not selective for other species.
Bibliography:	2007008453 M11 N20 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0919-9268 1444-2906
DOI:	10.1111/j.1444-2906.2006.01181.x