我国池塘养鱼亩产千斤以上的高产塘,各地虽有不少,但就全国范围来说,发展很不平衡,多数池塘仍处于低产水平。1981年全国平均塘鱼单产只有113.1斤,就是养鱼水平较好的江浙、两广、两湖的706万亩池塘.平均亩产也只有156.5斤。影响池塘养鱼产量的原因很多,其中重要的一条是:传统的养鱼制度已不适应生产的发展,鱼类的饲养周期过长,鱼类本身快速生长的潜力未能充分发挥。以长江流域为例,目前从鱼苗养成食用鱼的周期,一般花白鲢、鲤、鲫、团头鲂为二年,青、草鱼 Although there are a lot of high-yielding ponds in our country where ponds produce more than one kilogram of mussels per mu, the development is uneven across the country and most of the ponds are still at low-yield levels. In 1981, the national average yield of only 130.1 kg of pure-weight pond fish was 7.06 million mu of ponds in Jiangsu, Zhejiang, Guangdong and Guangxi and Hunan with a good fish culture rate, with an average yield of 156.5 kg per mu. There are many reasons that affect the production of fish in ponds. The important one is that the traditional fish farming system is no longer adapted to the development of production. The long feeding cycle of fish and the potential for rapid growth of fish itself have not been fully realized. Taking the Yangtze River Basin as an example, the current period of raising fish food from fish, the general silver carp, carp, crucian carp, bream for two years, grass, grass carp