江苏省宝应湖鱼类组成和优势种研究

Study on Fish Composition and Dominant Species in Baoying Lake,Jiangsu Province

[目的]对江苏省宝应湖鱼类组成进行研究。[方法]2012年9月至2014年5月通过标本采集和走访调查的方法对扬州市宝应湖鱼类种群结构进行了研究。[结果]宝应湖鱼类有41种,隶属7目、14科、33属。其中,物种数最多的为鲤形目,达26种,占调查鱼类物种总数的63.41%。从相对重要性指标（IRI）来看,宝应湖鱼类的优势种分别为鲫鱼、红鳍原鲌、条、贝氏条,多数优势种的平均体重为8.63~18.31 g。[结论]宝应湖鱼类种数减少,低龄化、小型化严重。

[Objective] To study fish composition in Baoying Lake, Jiangsu Province. [Method] The fish community structure in the Baoying Lake in Yangzhou City were analyzed by specimen collection and visit investigation september, 2012 to May, 2014. [ Result] The survey results showed that there are 41 fish species belonging to 7 orders, 14 families, 33 genus in Baoying Lake. The Cyprinidae consisting of 26 species was the largest family in the number of species, accounting for 63.41%. According to the results of index of relative importance （IR/） calculation, the dominant species in Baoying Lake were Carassius auratus, Cultrichthys erythropterus, Hemiculter leucisctdus, Hemiculter bleekeri, respectively, and the mean weight of the dominant species was 8.63 -18.31 g. [ Conclusion] The fish resources in Baoying Lake tend to be young in age and miniaturized in size.