Latin american journal of aquatic research
On-line version ISSN 0718-560X
SILVA¹, Catarina N.S; DIAS, José H; CATTANI, André P and SPACH, Henry L. Relative efficiency of square-mesh codends in an artisanal fishery in southern Brazil. Lat. Am. J. Aquat. Res. [online]. 2012, vol.40, n.1, pp. 124-133. ISSN 0718-560X. http://dx.doi.org/10.4067/S0718-560X2012000100012.
The relative efficiency of two square-mesh codend designs with the same circumference (~2 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 Paraná, 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 Paraná, Brazil.
Keywords : discards; shrimp fishery; bycatch reduction devices; square-mesh; size selection; fisheries management; southern Brazil.