湖洎是渔业水域的重要组成部分,是获得鱼产品的天然基地。目前世界各国对发展湖泊渔业都十分重视。对于小型湖,多采取与池塘养鱼相类似的精养方法。而对于大中型湖泊(一般指5万亩以上的湖洎),除了在局部水面设置网箱及围拦养鱼外,移殖和放流非本湖的鱼类,是增殖湖洎鱼类资源的主重手段。移殖放流有两种情况:一种是引进的鱼类可在湖泊中自然繁殖后代,形成新的种群,称为移殖驯化;另一种是放流的鱼类不能自然繁殖,每年需要重新投放鱼种,才能获得鱼产品,如我国的“四大家鱼”,这种 The lakeshore is an important part of the fishery waters and is the natural base for obtaining fish products. At present, all countries in the world attach great importance to the development of lake fisheries. For small lakes, adopt more intensive methods similar to pond fish farming. For large and medium-sized lakes (generally referred to as lakes and lakes of more than 50,000 mu), in addition to setting up cages on the local water surface and enclosing fish, the fish that are not transplanted and released from the lake are those that increase lakes and fish resources The main method. There are two cases of transmigration: one is introduction of fish, which naturally breeds in lakes and forms new stocks, called acclimatization; the other is that the fish released can not reproduce spontaneously and need to be re-released each year Fish species, in order to obtain fish products, such as China’s “four big fish”, this