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哈氏仿对虾是东海北部主要的拖虾渔业对象。在雌性的体长组成中 ,70～ 90mm的个体占优势 ,占总数的6 3%。应用ELEFANⅠ和ELEFANⅡ技术对哈氏仿对虾每月的体长资料进行分析 ,结果表明 :生长参数K =1.7,极限体长L∞ =12 8mm ,自然死亡系数M =2 .742 7,总死亡系数Z =8.32 3 ,利用率E =6 7.0 6 % ,极限年龄为 1.32 34岁 ,选择体长为 5 9.6 7mm ,补充类型为二季补充型。通过单位补充量产量Y/R和单位补充量产值Yv/R分析表明 ,该群体的利用已到了相当充分的水平 ,若保持现有的捕捞水平 ,把开捕体长增大至 70mm时 ,单位补充量产量可增加 1.77% ,产值可增加 10 .78%。但若捕捞死亡水平继续增加 ,产量几乎不再增加 ,而产值却明显下降。
Haste is the main shrimp fishery in northern East China Sea. In female body length composition, 70 ~ 90mm of individual predominance, accounting for 63% of the total. The monthly body length data of H. prawn were analyzed by using ELEFANⅠ and ELEFANⅡtechniques. The results showed that the growth parameters K = 1.7, the limit body length L∞ = 12 8mm, the natural death coefficient M = 2.742 7, the total death factor Z = 8.32 3, utilization E = 6 7.0 6%, the age limit of 1.32 34 years old, body length selection of 5 9.6 7mm, supplementation type for the second quarter supplemented type. Through the unit output volume Y / R and output unit output Yv / R analysis showed that the use of this group has reached a fairly adequate level, if the existing fishing level is maintained, the open capture body length increased to 70mm, the unit The amount of replenishment can increase 1.77%, the output value can increase 10.78%. However, if the level of fishing deaths continues to increase, the output will hardly increase and the output value will obviously decrease.