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本文通过秋季采用套网法对东海区桁杆拖虾网的选择性试验,对桁杆拖虾网的3种网囊网目尺寸进行了分析研究,结果表明:当网囊网目尺寸为30mm、35mm和50mm时,哈氏仿对虾的50%选择体长分别为47.15mm、54.98mm和78.48mm;斑节对虾的50%选择体长分别为57.07mm、64.65mm和87.06mm;总体虾类的50%选择体长分别为56.08mm、65.76mm和83.80mm。虾类网囊网目内径(Me)与50%选择体长(L0.5)之间的关系:哈氏仿对虾:L0.5=1.5665Me+0.1527,R2=1;斑节对虾:L0.5=1.4982Me+12.161,R2=1;总体虾类:L0.5=1.3392Me+17.306,R2=0.9856。
In this paper, three kinds of mesh size of trawl shrimp nets were analyzed and studied by using the nets method in the East China Sea in autumn. The results showed that when mesh size was 30mm , 35mm and 50mm respectively, the body length of 50% selection for Haste’s mongolian shrimp were 47.15mm, 54.98mm and 78.48mm, respectively. The body length of 50% of P. monodon was 57.07mm, 64.65mm and 87.06mm, respectively. The 50% body lengths were 56.08 mm, 65.76 mm and 83.80 mm, respectively. The relationship between the net inner diameter (Me) of shrimp cysts and 50% of selected body length (L0.5): shrimp: L0.5 = 1.5665Me + 0.1527, R2 = 1; 5 = 1.4982Me + 12.161, R2 = 1; overall shrimp: L0.5 = 1.3392Me + 17.306, R2 = 0.9856.