二龙湖水库的鱼类群落结构

Community structure of fishes in the Erlonghu Reservoir

2017年2月和7月对二龙湖水库开展了鱼类群落结构调查,共采集到鱼类22种,隶属于4目8科22属,以杂食性鱼类为主,其中鲤科鱼类占59.09%,主要的经济鱼类为鲢、鲫和鲤。对调查获得的22种鱼类产卵类型进行分析结果显示,产黏性卵鱼类和漂浮性卵鱼类分别占总种数的68.18%和27.27%。夏季渔获物的种类、数量和多样性指数都高于冬季。库区鱼类具有群落结构简单化、鱼类资源小型化的特点,资源前景不容乐观,需加强保护措施。

Fish resources of the Erlonghu Reservoir were investigated in February and July 2017. A to tal of 22 fish species were identified,which belong to 4 orders,8 families and 22 genera. Community structure of fishes was dominated by small, omnivorous fishes. Erlonghu Reservoir; fishery resource; community structure Cyprinidae took up 59.09 G of the to tal species. The main economic fish species in the reservoir include Hypophthalmichthys molitrix, Carassius auratus and Crprinius carpio. Analysis on spawning type of the 22 species of fish showed that 68.18% of the species producing sticky egg,while 27. 27% of them producing drifting egg. Spe cies abundance in summer was higher than that in winter. Fish resources in the reservoir showed the trend of simple in community structure and small in size of fishes, which is not optimistic in the fu ture. Protection of fish resources should be strengthened.