Abstract
Reduction of the by-catch in shrimp fishery is an important goal worldwide. In order to compare by-catch using the conventional trawling net and a newly designed short funnel net, nine cruises were carried out by the commercial fleet operating in the Gulf of Tehuantepec, Mexico. A total of 480 trawls were done (mean duration: 85 min). The experimental trawls using the modified net produced a 21.13-28.86% by-catch reduction (confidence interval 95%), a 3% increase of shrimp catch, and a significant reduction on net recovery time.
Highlights
Shrimp trawling fishery in the México started in 1927 (Ferreira 1965, Igartua 1992) and development in fishing techniques and gear structure has not been constant
Afterwards, Conolly (1992) in Brazil modified the shape of the traditional net by reducing the original length from 20.1 m to 11.25 m, to compare the differences of shrimp accompanying fauna (SAF) of both trawl nets within the commercial fleet
Statistical tests were applied to shrimp catches and by-catch data, in order to determine significant statistical differences between conventional and modified fishing gears
Summary
Shrimp trawling fishery in the México started in 1927 (Ferreira 1965, Igartua 1992) and development in fishing techniques and gear structure has not been constant. Some years later, Ercoli (1989) developed a selective device denominated DISELA, in order to reduce incidental catch of hake in the prawn fishery in Argentina; the device was incorporated in a 180 feet net size of mouth. Results of those experimental cruises indicated that when installed to the net, the excluder produced a 70 % escape of hake, and an 18 % loss of prawn was observed, the device did not affect the size composition of the prawn catch. Because of the importance of a sustainable use of marine resources, a traditional trawl and a modified trawl were tested in the Gulf
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