天津海域春夏季节游泳动物的组成特征

Nekton composition in the coastal waters off Tianjin in spring and summer

根据2014年5月及8月在天津海域进行的底拖网调查资料,对该海域游泳动物组成特征进行了初步研究。结果表明,在该海域共捕获游泳动物36种,平均资源密度为126 297.13个/km^2和1 494.40 kg/km^2。以个体密度计算群落多样性,Shannon-Wiener种类多样性指数H′平均为1.803,Margalef种类丰富度指数d平均为0.592,Pielou种类均匀度指数J平均为0.537。资源密度及物种多样性,8月均优于5月。优势种为口虾蛄,重要种为火枪乌贼、日本、斑、六丝钝尾虾虎鱼。天津近岸海域游泳动物渔业资源呈现出低质化的趋势。

The characteristics of nekton composition were preliminarily analyzed based on the bottom trawl surveys in the southern coastal waters off Tianjin in May and August 2014.Results indicated that 36 species were collected from the bottom trawl surveys.The mean densities were 126 297.13 ind/km2 and 1 494.40 kg/km2.The species richness d,the Shannon diversity index H,and the evenness index J were 1.083,0.592,and 0.537 for the nekton community,respectively.The dominant species were Oratosquilla oratoria,and the important species were Loligo beka,Charybdis japonica,Clupanodon punctatus.and Chaeturichthys hexanema.The fishery resources were characterized by fishes of low values.