Relative efficiency of square-mesh codends in an artisanal fishery in southern Brazil

The relative efficiency of two square-mesh codend designs with the same circumference ( arrow up m) but different mesh sizes and materials (32 mm polyethylene-PE and 30 mm polyamide-PA) was tested in an artisanal shrimp trawl fishery in Parana, southern Brazil. The two square-mesh codends were haule...

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Bibliographic Details
Published in:	Latin american journal of aquatic research Vol. 40; no. 1; pp. 124 - 133
Main Authors:	Silva, CNS, Dias, J H, Cattani, AP, Spach, H L
Format:	Journal Article
Language:	English
Published:	01-01-2012
Subjects:	Marine Stellifer rastrifer Xiphopenaeus kroyeri ASW, Brazil, Parana
Online Access:	Get full text
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Summary:	The relative efficiency of two square-mesh codend designs with the same circumference ( arrow up m) but different mesh sizes and materials (32 mm polyethylene-PE and 30 mm polyamide-PA) was tested in an artisanal shrimp trawl fishery in Parana, southern Brazil. The two square-mesh codends were hauled alternately with a 26 mm diamond-shaped mesh codend (control) in a twin gear configuration. Although not significant, the mean numbers of total bycatch were reduced by 16.6 and 10.0% with the 32 and 30 mm square-mesh codends, respectively. The results indicate significant improvement in size selectivity for some species (Xiphopenaeus kroyeri and Stellifer rastrifer). The operational changes tested can be a suitable technical solution for reducing the capture of immature organisms in the shrimp trawl fishery in Parana, Brazil.Original Abstract: La eficiencia relativa de dos disenos de copos con malla cuadrada con la misma circunferencia ( arrow up m) pero diferentes tamanos de malla y materiales (32 mm de polietileno-PE y 30 mm de poliamida PA) ha sido evaluada en una pesqueria de arrastre artesanal de camaron en Parana, sur de Brasil. Los dos copos de malla cuadrada fueron arrastrados alternativamente con un copo de malla de 26 mm en forma de diamante (control) en una configuracion de doble arrastre. Aunque no es significativo, el numero medio de la captura incidental total se redujo en 16,6 y 10,0% en los copos de malla cuadrada de 32 y 30 mm, respectivamente. Los resultados indican que se logra una significativa mejora en la selectividad por tamano medio de algunas especies (Xiphopenaeus kroyeri y Stellifer rastrifer). Los cambios operacionales evaluados pueden representar una solucion tecnica adecuada para reducir las capturas de organismos inmaduros en la pesqueria de arrastre de camaron en Parana, Brasil.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0718-560X
DOI:	10.3856/vol40-issue1-fulltext-12