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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。
In this paper, the survey data of 3 voyages at the fishing grounds of the Changjiang Estuary in 2003 are used to analyze the status of fishery resources in this area. The results showed that there were altogether 79 species of fishery caught in the three survey voyages, of which 49 species were fish, belonging to 11 orders, 30 families and 45 genera; there were 20 species of shrimp and crab; 10 species of cephalopods belonging to 3 orders, 6 families, 6 genera. The three survey voyages are based on the highest fish resource index, the resource tail number density shrimp crabs higher than the cephalopods, resource weight density in June than in shrimp and crabs less than the cephalopods, April and September 2 voyages are higher than the cephalopods. The resource index of fish and shrimp and crab reached the maximum in September and lowest in June. The resource index of cephalopods was the highest in April and the lowest in September. The dominant species composition changes are as follows: yellow carp and small yellow croaker in April, yellow croaker and Pacific tilapia in June, octopus and yellow croaker in September.