为了使中小型水库鱼类区系组成朝着人们所希望的方向发展,应对水库鱼类的品种不断给予调整,使水体中能保持数量较多和质量较好的优势群体,达到水库鱼类自然资源增殖的目的。为此,必须切实掌握以下三个环节。一、抑制凶猛鱼类和经济价值低的鱼类。中小型水库的凶猛食性鱼类主要有翘嘴红鲌、鳡鱼、马口鱼、鲶鱼、鳜鱼、乌鳢等数种。它们能捕食放养的鱼种,是影响水库放养鱼种成活率的主要因素之一。杂鱼主要有(?)条、逆鱼、麦穗鱼、棒花鱼、黄颡鱼和鳑鮍等数种。它们生长 In order to make the composition of fish fauna of small and medium-sized reservoirs develop in the hope of people, the species of reservoirs should be constantly adjusted so that the dominant groups in the water body can maintain a larger quantity and better quality, The purpose of proliferation of resources. To this end, we must effectively grasp the following three aspects. First, the suppression of ferocious fish and low economic value of fish. Small and medium-sized reservoirs of fierce feeding fish are mainly Cichlid, mackerel, mackerel, catfish, mackerel, blackbird and other species. They can prey on stocking species, is one of the main factors affecting the survival rate of stocking species in reservoirs. Trash fish are mainly (?), Counter fish, wheat spike fish, catfish, catfish and catfish, and other species. They grow