东海中部鱼类群落多样性的季节变化

根据2001年4月、6月、9月和12月东海中部(27°00′～30°00′N、122°30′～127°00′E)底拖网调查资料,分析了该海域鱼类群落多样性的季节变化。调查中共捕获鱼类161种,平均站位出现鱼类10.95种;优势种类中除了带鱼(Trichiurusjaponicus)、银鲳(Pampusargenteus)、小黄鱼(Larimichthyspolyactis)等经济种类外,其它大部分种类为经济价值不高或小型的鱼类。各调查航次的优势种类排序和组成不同。通过分析发现东海中部鱼类群落多样性指数较低,同时各调查月份的多样性指数差异较大,6月份的各项指数均为最低,12月份为最高,这是各调查月份主要种类的优势度不同引起的。

Seasonal Changes on fish community diversity in the middle part of the East China Sea

Based on the data of bottom trawl surveys in the middle part of the East China Sea in April, June, September and December 2001, the seasonal changes on diversity of fish community were analyzed in this paper. A total of 161 species of fish were caught during the surveys and the average species number in each site were 10.95. The majority of the dominant species were less commercial and smaller in size, except some main commercial species, such as largehead hairtail Trichiurus japonicus, slivery pomfret Pampus argenteus, little yellow croaker Pseudosciaena polyactis. The diversity indices of fish community in the middle part of the East China Sea were relatively low. The diversity indices by month were obviously different with December the highest and June the lowest.