Community structure and diversity of fishes in Qiandao Lake

Abstract:

Gillnet surveys were conducted on the fishes resources in Qiandao Lake during July 2010 to October 2011 and March 2012 to February 2013. Transparency, total phosphorus, total nitrogen, chlorophyll a, nitrate, ammonia, temperature and other water quality parameters were measured simultaneously. 54 fish species were collected,belonging to 11 families,and 6 orders. Cypriniformes had the largest species number which accounted for 72.2% of the total.Ecotypes of different fish species were classified according to habitat and migratory ways, vertical distribution of the dwelling water layer and the diet types. The dominant species were of small and medium-sized sedentary fish such as Xenocypris microleps, Sinibrama macrops, Culter mongolicus, and Culter alburnus. Fish diversity index was estimated using individual numbers or biomass, Margalef richness index D_N and D_W were 1.72 and 0.74 respectively, while Shannon diversity indices H'_N and H'_W were 1.40 and 1.41 respectively. Pielou evenness indices J'_N and J'_W in the Lake were 0.70 and 0.71,respectively.