长兴岛周边海域夏季渔业资源现状初步调查

于2010年6月和8月采用底拖网对长兴岛周边海域的渔业资源进行了调查。结果表明：该海域有游泳动物38种，其中鱼类21种，虾类7种，蟹类6种，头足类4种；6月优势种为焦氏舌鳎、口虾蛄、日本蝇、长蛸、许氏平鱼由和大泷六线鱼，8月优势种为矛尾嘏虎鱼、口虾蛄、黄鲅鲸、日本蜉、焦氏舌鳎、葛氏长臂虾、斑纹蛳子鱼和细纹鲫子鱼。生物多样性评价结果表明，物种多样性指数从1992年的2．53降到现在的1．83，渔业资源群落结构发生了较大变化，种类减少，种的均衡性变差。

The preliminary investigation on status of fishery resources off Changxing Island in summer

The status of fishery resources were evaluated by the data collected by the bottom trawls in the sea around Changxing Island in Dalian. The results showed that 38 species of nekton were found including 21 species of fish, 7 species shrimp,6 species crab and 4 species cephalopod. With regard to the index of relative importance（IRI）, Cynoglossus joyneri, Oratosguilla oratoria, Charybdis japonica, Octopus variabilis, Sebastes schlegeli, and Hexagrammos otakii were dominant species in June, and Chaeturichthys stigmaticu, Oratosguilla oratoria ,Lophius litulon, Charybdis japonica, Cynoglossus joyneri, Palaemon （Palaemon） gravieri, Liparis maculates, and Liparis tanakae were in August. The fish community in the sea around Changxingdao island was changed from 20th century to 2010, with the Shannon-wiener index from 2.53 down to 1.83 indicating that the numher and evenness of species was reduced.