舟山沿岸定置张网作业休渔前后鱼类组成分析

根据2007-2009年舟山沿岸定置张网作业渔业资源调查资料,对休渔前后（5月和9月）张网作业渔获物组成进行比较分析。结果表明：休渔前（5月）优势种为鳀鱼、矛尾鰕虎鱼、带鱼、银鲳和黄鲫,其渔获重量占总渔获重量的96.2%;休渔后（9月）以龙头鱼、带鱼、黄鲫和小黄鱼为优势种,其渔获量占总渔获量的77.6%。5月平均每网每天共损害带鱼、小黄鱼和银鲳幼鱼1 030尾,9月平均每网每天损害带鱼、小黄鱼和银鲳幼鱼587尾,比5月减少75.5%。舟山近岸张网休渔后（9月）主要经济种类渔获个体和重量均较休渔前（5月）有大幅增加,通过3个月的休渔,对经济种类的资源养护确实有一定效果,但是渔获个体仍然较小,大多数个体仍然没有达到开捕规格,建议定置张网休渔可以向前推移1个月。

Composition of Set-Net Catch Before and After Fishing Off Season in Zhoushan Coast Areas

Based on survey date before and after Fishing Off Season（May and September） in Zhoushan coast between 2007 and 2009.The results showed that： In May,the main fish species was Engraulis japonicus,Chaeturichthys stigmatias,Trichiurus japonicus,Pampus argenteus and Setipinna taty,the weight of these species occupied 96.2% in total catch weight;in September,the main fish species was H.nehereus,T.japonicus,Larimichthys polyactis,S.taty,the weight occupied 77.6% of total catch weight,on May per stow net were damaged 860 juveniles of T.japonicus,P.argenteus and L.polyactis per day,on May the number of damaged juveniles declined to 587 per day,have 75.5% reduction than May.The weight and number of catch of stow net after fishing off season（in Sept） were substantially increased than those before fishing off season（in May）,by a three-month fishing off do have good affection to conservation economy species.But the catch individuals is still too small,most individuals still do not reach catchable size,the fishing ban should be extended a month before the fishing off season.