Species composition and diversity of fish in Qingshitan Reservoir in Guilin, Guangxi

A survey of fish resources in Qingshitan Reservoir was conducted from April 2015 to January 2016.And 3 750 fish(153.28 kg)were collected, and 32 species belonging to 5 orders, 12 families and 27 genera had been identified. Cypriniformes, which accounted for 53.13% of all species and 61.92% of all individuals, was the dominant fish fauna. According to the analysis of relative importance index (IRI), the most dominant species were Carassius auratus, Cyprinus carpio and Hemiculter leucisculus. The analysis of species diversity shows that Margalef index (D) was 2.58~3.52;the Shannon-Wiener species diversity index (H′) was 1.62~1.92;the Pielou evenness index (J′) was 0.53~0.63, which was the highest in summer but relatively lower in winter. The diversity of fish decreased from the mouths of streams, and from islands to the center of the reservoir. The result of species diversity analysis indicates that there was no significant difference in the fish communities among seasons and sampling sites.