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首页> 外文期刊>Fisheries and Aquatic Sciences >Bycatch Reduction by Experimental Shaking Codend Attached with Canvas in a Bottom Trawl
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Bycatch Reduction by Experimental Shaking Codend Attached with Canvas in a Bottom Trawl

机译：通过在底拖网中附有帆布的实验摇码Code减少兼捕

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摘要

An active stimulating method for juvenile fishes to drive escaping from mesh of the codend was examined by shaking canvas in the bottom trawl followed by shrimp beam trawl. Field fishing trials by a bottom trawl were carried out between the Geomoondoand Jejudo in west of South sea, Korea by conver-net methods to examine the effect on the reduction of juvenile fish as a discard catch by generating a shaking movement of the codend using two pieces of asymmetrical semi-circular canvas. The mean periodof the shaking motion with the round canvas was 10-15 s, and the range of amplitude as a vertical depth change was up to 0.4-0.6 m when towing speed 3.4-4.3 k't as estimated by peak event analysis. The escape rate of juvenile fish in conver-net by totaljuvenile bycatch (codend and cover-net) in 14 trials increased from 20% in a steady codend to 34% using a shaking codend in the bottom trawl, while the marketing catch or total bycatch was similar between steady and shaking cod ends. There was no difference in the body size of the fish and species composition between the steady and shaking cod ends. Above results demonstrate a new method for bycatch reduction actually up to 18%) using an active stimulating device, although further experiments are neededto increase an effective shaking motion of the codend in amplitude and period for more bycatch reduction.
机译：通过摇动底拖网中的帆布，然后摇动虾拖网，研究了一种主动刺激幼鱼从for网逃逸的刺激方法。在韩国南海西部的Geomoondo和济州岛之间，通过网网法进行了底部拖网的田间捕鱼试验，通过使用两个来产生the的摇动运动，研究了减少作为丢弃物的幼鱼减少的影响件不对称的半圆形画布。通过峰值事件分析估计，当拖曳速度为3.4-4.3 k't时，用圆形帆布进行的平均振动周期为10-15 s，垂直深度变化的幅度范围高达0.4-0.6 m。在14个试验中，通过共生幼鱼捕获量（鱼网和掩网）在融合网中幼鱼的逃逸率从稳定鱼网中的20％增至使用底部拖网中摇动鱼网的34％，而市场捕获或总兼捕在稳定的和摇晃的鳕鱼头之间相似。在稳定的和摇晃的鳕鱼末端之间，鱼的体型和种类组成没有差异。以上结果证明了一种使用有源刺激装置将副渔获物减少多达18％的新方法，尽管还需要进一步的实验来提高码域在幅度和周期上的有效摇动，以进一步减少副渔获物。

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