Abstract:

The Oujiang River is the second biggest river in Zhejiang Province and its fish resources are very rich.But comprehensive survey of fish resources has not been made since 1972.We made an investigation of fish resources of the Oujiang River from its upstream (Chatian Town) to the downstream (Haikou Town) in 2010.1 246 fish specimens were collected,which belonged to 5 orders,14 families,46 genera and 60 species.Compared to 1972 survey results,34 species were not collected, including 4 species in the database of Chinese endangered animals:〖WTBX〗 Acipenser sinensis〖WTBZ〗, Macrura reevesii, Plecoglossus altivelis and Anguilla marmorata; and 20 species were new record, including 2 exotic fish species: Tilapia mossambica and Micropterus salmoides. We analyzed community similarity, dominant species composition, biological diversity of five sample sites,and found that the upstream fish community had higher biodiversity than the downstream.CPUE of this investigation was 45 kg/boat/day,only 25% as in 1972,which indicated that the fish resources were decline badly. In this paper we analyzed the reasons and proposed the protection measures