Strategies to avoid by-catch in shrimp trawling
1982
Sternin, V. | Allsopp, W.H.L. (International Development Research Centre, Vancouver (Canada))
Strategies that have been used to reduce fish by-catch in commercial shrimp fisheries are briefly reviewed. One possibility is to deter the fish from entering the shrimp nets by appropriate stimuli that induce escape reactions in fish while leaving shrimp vulnerable to capture. To be effective, such stimuli must be applied at a point perhaps 1 minute ahead of the trawl. Sound seems to offer the best potential. The radius of influence of sound-induced stimuli is sufficiently large to warrant consideration, and sound frequencies sufficient to induce avoidance reactions in fish can be generated at energy requirements available in the power supply of most shrimp trawlers. The presentation concludes by briefly outlining a test program sequence that could be carried out jointly by a number of agencies.
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