Abstract: A total of more than 2500 specimen of fish belonging to 71 species (subspecies) in the Qingshui River, Guizhou Province were collected in 2002—2004, and their ecological habits were surveyed. Of the 71 species (subspecies), 52 species (subspecies) including Cobitis sinensis, Culter oxycephaloides, Coreosiniperca roulei and Leiocassis longirostris were newly recorded in the river, and Paracobitis variegates, Leptobotia elongate, Pseudohemiculter hainanensis, Glyptothorax fukiensis, and Pelteobagrus eupogon were first found to be distributed in the Yuanjiang River system. Based on the historical records and this survey, it was concluded that the fish fauna in the Qingshui River comprised 86 species (subspecies), 57 genera, 13 families and 4 orders. Of the 86 species (subspecies), only Clarias fuscus was exogenous, and the rest were indigenous. The fish fauna in the river presented the characters of dominant by indigenous species and companying with special species and vulnerable and endangered species, and of complex components and sharing the fish species with that in the Pearl River system. The fish in the Qingshui River belonged to different ecological types in migration, feeding, reproduction, and inhabitation.

Key words: Arbuscular mycorrhizal fungi, Tagetes erecta, Growth indexes, Diesel degradation