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通过东海区拖网网囊网目对带鱼和小黄鱼的选择性试验,对拖网最适网囊网目尺寸进行了分析研究。结果表明:1.网囊网目45 mm,小黄鱼和带鱼的逃逸率均较低,渔获中兼捕大量当年生经济幼鱼;2.网囊网目54 mm,小黄鱼的50%选择体长尚小于其优势体长组范围,带鱼的50%选择体长已部分进入其优势体长组范围;3.网囊网目65mm,选择体长范围与选择鱼种的优势体长组范围基本一致。综合分析认为:目前东海区最理想的拖网网囊网目不小于60 mm。
Through the selective test of octopus and small yellow croaker in the trawl mesh in the East China Sea, the optimal mesh size of the trawl was analyzed. The results showed that: 1. Reticulated cytoplasm 45 mm, the escape rate of small yellow croaker and octopus were low, catching a large number of current annual economic juveniles; 2 mesh net mesh 54 mm, 50% of small yellow croaker body length The body length of 50% of the octopus had already partially entered the range of its dominant body length. 3. The range of body length of the selected body length range and the preferred body length of the selected species was basically the same . Comprehensive analysis shows that: At present, the best trawl mesh in the East China Sea is not less than 60 mm.