黄河口海域弓子网渔获物组成及其季节变化

2007年5和7月，利用弓子网开展了东营黄河口海域底层渔业资源调查，分析了该海域底层渔业资源结构，分别计算了春、夏两季渔业生物群落的种类丰度指数（R）、Shannon—Wiener多样性指数（HJ）、均匀度指数（J＇）和生物量指数（b）。春、夏季平均网获量分别为0．927和2．12kg／h。R、H’和J’指数分别为12．08、2．277、0．64和10．91、2．743、0．76。分析结果表明，夏季底层生物资源较春季丰富，渔业生物群落的多样性指数也较春季高。优势种为纵肋织纹螺、六丝矛尾鰕虎鱼和口虾蛄等。

Composition of catches by beam trawl and its seasonal variations in Yellow River estuary

Based on the beam trawl surveys in Yellow River estuary which were conducted in May and July, 2007, benthic fisheries resources in this area were analyzed and calculated using species richness R, Shannon-Wiener diversity index H', evenness index J ' and biology index b, respectively. In our study, the average catch biomass per net was 0.927 and 2.12 kg/h, R, H' and J' were 12.08, 2.277, 0.64 and 10.91, 2.743, 0.76 in spring and summer, respectively.The results showed that the benthic biological resources were richer in summer than in spring, and the diversity indices of the community were also higher in summer. Moreover, dominant species were Nassarius variciferus, Chaeturichthys hexanema, and Oratosquilla oratoria etc. The data provided a scientific basis for protection of fishery biology diversities and resources restoration in Yellow River estuary.