The Study On Comparation Of Fish Community Structure Between Lake Xingkai And Lake Mini-xingkai

This dissertation is based on the research of lake Xingkai and lake Mini-xingkai’s field visits in July and October2012. And this paper emphasizes on the analysis of the various species of fish, the differences on density of fish, as well as the diversity of dominate fish species between lake Xingkai and lake Mini-xingkai. This essay also analyzes on the length and weight of some advantaged fish species. And then we take the different hydrological characteristics and catching intensity into consideration. At last this dissertation makes a summery about the diversity of fish species in lake Xingkai and lake Mini-xingkai and its corresponding reason of this phenomenon.Fish fauna was surveyed and identified.A total of50species were found, belonging to5orders,12families38genera, Captive fish are all belonging to Osteichthyes, of which Cyprinformes Cyprinidae were largest, there are36species, accounting for72%, which were the main categories of fauna composition in lake Xingkai. The35species of lake Mini-xingkai which collected were all found in lake Xingkai,but15species in lake Xingkai haven’t been found in lake Mini-xingkai.According to dominance in descending of lake Xingkai,the order are:Erythroculter dabryi shinkainensis, Hemiculter bleekeri lucidu, Pelteobagrus nitidus, Hemiculter leucisculus, Cyprinus(Cyprinus) carpio, Erythroculter ilishaeformi; According to dominance in descending of lake Xingkai,the order are:Culter erythropterus, Hemiculter bleekeri lucidu, Carassius auratus gibelio, Pelteobagrus nitidus, Erythroculter dabryi shinkainensis, Erythroculter ilishaeformi.Fish fauna components of Xingkai Lake were complex, belonging to the TertiaryFlora,the Arctie freshwater fauna,the northern Plains flora,fauna in the northern mountains,rivers and Plains flora,fauna of subtropieal plains in six fish fauna complex,of which the river plain fish fauna was most complex types, accounting for42.55%of all types.The index of lake Xingkai showed Shannon-Weaver index to0.916;Marglef index to2.62; Simpson index to0.834; Pielon evenness index to0.171, The index of lake Mini-xingkai showed Shannon-Weaver index to0.928;Marglef index to8.5; Simpson index to0.793; Pielon evenness index to0.601.both lake Xingkai and lake Mini-xingkai diversity index and evenness index were lower.The main reason for the difference between the lake Xingkai and lake Mini-xingkai of fish communities:(1)lake Xingkai and lake Mini-xingkai Fishing in a different way;(2) The aquat-ic environment of lake Xingkai and lake Mini-xingkai is different;(3) lake Xingkai connected with the Wusuli River, Migratory fish is more abundant;(4) lake Mini-xingkai priority to with artificial breeding, farming economic fish. Create a difference in the fish community structure from lake Xingkai.