Abstract: Based on survey at 4 representative sections in main stream of Emin River in October 2016, fish community structure was analyzed. A total of 3148 fish belonging to 3 orders, 4 families, 10 genera and 11 species were collected. The dominant species in main stream of Emin River were Carassius auratus Linnaeus, Triplophysa strauchiiKessler, Pseudorasbora parva Temminck et Schlegel,Triplophysa stoliczkae Steindachner and Abbottina rivularis Basilewsky. The analysis of fish community diversity showed that diversity indices of section 1 and section 4 were higher than those of other two sections. According to analysis of DCA and RDA, fish community was classified into 3 groups: section 1 and section 2, section 3, section 4. pH and dissolved oxygen (DO) were the major environmental factors affecting the fish community, followed by temperature and conductivity. This study preliminarily revealed the fish community structure characteristic in main stream of Emin River, and provided reference for conservation and utilization of fish resources in the study region.

Key words: inhibitory activity, bio-control., Botrytis cinerea, Streptomyces chungwhensis