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Hydropower development had a significant effect on the fish habitat and their biological diversity To evaluating the cur⁃ rent status and changes of fishery resource of Wuqiangxi Reservoir 20 years after the completion of a hydroelectric dam, the fish re⁃ sources were investigated during April of 2012 to March of 2014 Results showed that a total of 86 fish species ( including 5 intro⁃ duced) were collected, belonging to 7 orders, 18 family, 58 genera Cypriniformes were dominant, accounting for 66 28% of the total species There were 54, 67 and 52 fish species found in the end,reservoir and downstream reach of Wuqiangxi Reservoir, re⁃ spectively The jaccard similarity coefficient showed that the fish communities of the reservoir area were highly similar to those at the dam sector, and moderately dissimilar to those at the reservoir tail It was also the same moderately dissimilar between the reser⁃ voir tail and the dam sector With regard to ecological type,fish communities in the Wuqiangxi Reservoir showed diversification types, the sedentary, omnivore and demersa species were dominant, accounting for 68 60% , 55 81% and 41 86% of the total species, respectively Despite the species of the catches in various sections were different, the species number such as Pelteobagrus fulvidraco, Carassius auratus, Cyprinuscarpio and Culter mongolicus occupied a higher proportion in each section The yield and di⁃ mension of the reservoir area were higher than those of the other two sections, and the catches showed miniaturization significantly We compared the fish species number of the reservoir area between the pre⁃ and post⁃dam periods,the fish species reduced 46 spe⁃ cies and dropped 40 71%  Some common economic fishes such as Ochetobius elongatus, Onychostoma sima, Brevifilis brevifilis and Leiocassis longirostris were not found.

Status and historical changes of fish resources of Wuqiangxi Reservoir on Yuanshui River in Hunan Province