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Fish composition and species biodiversity of the Beijing section of Juma River

YANG Wen-bo,LI Ji-long,LI Xu-xing,LIU Bao-xiang,SHEN Gong-ming ZHANG Xiao-hui,LEI Yun-lei,LI Xiao-shu,JIA Jing(Resources and Eco-environment Research Center of Chinese Academy of Fishery Sciences,Beijing 100039,China)  
In March,July,September 2004,species composition,distribution and diversity of fish in Juma River were investigated.A total of 24 species of fish subjected to 24 genera,8 families,3 orders were found in this river and Pseudorasbora parva is dominant.Most of these species are small Meso-pelagic or Demersal fishes.Compared to the results of historic survey,18 species,5 families and 3 orders of fishes have been absent,which indicated that fish species diversity has been damaged in Juma river and conservation measures are urgently needed.After analyzing these factors which may cause lower fish diversity,we found that changes of hydrography,dams and power plants construction,over-fishing and sand mining lawlessly are the main causes.At last,five conservation countermeasures to protect Juma River fish diversity are suggested:(1)establishing a nature reserve;(2)restricting construction project along the river;(3)enforcing fishing restriction measures;(4)restocking the lost fish species;(5)enhancing conservation awareness of both local residents and tourists.
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