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为解决单船有翼单囊底拖网作业时兼捕稚幼鱼比例较大的问题,增大了原生产网第五节网背网衣的网目尺寸,并将改进后的生产网作为试验网,在黄海北部海洋岛附近海域采用交替作业法进行原生产网和试验网各10网次的对比试验。结果表明:试验网的总渔获质量比原生产网减少69.87 kg;原生产网捕获27种渔获物,试验网捕获19种渔获物,比原生产网减少8种,兼捕现象得到缓解;相比原生产网,试验网中的各渔获种类体长分布范围向右偏移,说明体长范围偏小的渔获物得到一定释放。本研究结果可为中国拖网类渔具的结构优化和渔业资源保护提供参考。
In order to solve the problem of large proportion of juvenile fish and juvenile juvenile fish trawling at the bottom of a single-vessel winged single-bottom trawling net work, the mesh size of the back net of the fifth net of the original production net is enlarged and the improved production net is used as a test Network, in the Yellow Sea north of the sea near the island using the alternate operation of the original production network and test network of 10 net comparative test. The results showed that the total catch quality of the experimental net decreased by 69.87 kg compared with that of the original net, that of the original production net was 27, that of the net caught 19 kinds of catches, decreased by 8 compared with the original production net, and bycatch was relieved Compared with the original production network, the distribution range of the body length of each catching species in the experimental net deviates to the right, indicating that the catch with a smaller body length is released to some extent. The results of this study can provide reference for structural optimization and fishery resources protection of trawlers in China.