长江口渔场渔业生物资源动态分析

本文用 2 0 0 3年在长江口渔场 3个航次的调查数据 ,对该水域的渔业资源状况进行了分析。结果表明 :三个调查航次共捕获渔业生物 79种 ,其中鱼类 4 9种 ,隶属于 11目 ,30科 ,4 5属 ;虾蟹类共有 2 0种 ;头足类共有 10种 ,隶属于 3目 ,6科 ,6属。三个调查航次都是以鱼类的资源量指数最高 ,资源尾数密度表现为虾蟹类高于头足类 ,资源重量密度除 6月份虾蟹类低于头足类外 ,4月和 9月 2个航次都高于头足类。鱼类和虾蟹类的资源量指数值在 9月份达到最大 ,而 6月份为最低 ;头足类的资源量指数以 4月份最高 ,9月份最低。优势种组成的变化表现为 :4月份为黄鲫和小黄鱼 ,6月份为、黄和太平洋褶柔鱼 ,9月份为带鱼和小黄鱼。

Analysis on the dynamic of fishery biological resources on the fishing grounds of the Changjiang estuary

The paper analyzed the dynamic of fishery biological resources on the fishing grounds of the Changjiang estuary based on the data which obtained from the three investigating trips in 2003. The results indicated that there were 79 species in all, of which 49 species were fishes belonging to 45 genera in 30 families of 11 orders; 20 species were crustaceans; 10 species were cephalopods, belonging to 6 genera in 6 families of 3 orders. In the three investigating trips, the abundance index of fishes was the highest but the individual abundance was crustacean higher than cephalopod, and the weight abundance was crustacean higher than cephalopod except in June. The abundance indices of fish and crustacean were both the highest in September and the lowest in June, while that of cephalopod was the highest in April and the lowest in September. The dominant species composition was that Setipinna taty and Pseudosciaena polyactis occurred in April; Engraulis japonicus, Lophius litulon and Todarodes pacificus in June; Trichiurus japonicus and Pseudosciaena polyactis in September.