长沙市郊区池塘依赖城市污水以养殖鲢、鳙鱼为主,育种与成鱼水面按三、七比例配套养殖周期长,不但品种单一,而且80％的商品鱼集中在下半年上市,生产发展速度缓慢。为改革这种传统的养殖制度,根据轮捕轮放的原理和不同鱼类的生物学特性以及不同季节,池塘饵料生物的组成,环境因子的差异等提出并采用了“双养一套”养殖法的新养殖制度。其方法是:上半年重点养殖鲢、鳙鱼,下半年重点养殖罗非鱼,年中套养各类夏花鱼种,并把“双养 In the suburbs of Changsha City, the ponds mainly rely on urban sewage to grow silver carp and bighead carp. The breeding and adult fish have three or seven breeding cycles. Not only the breed is single, but 80% of the fish are concentrated in the second half of the year, and the production is slow to develop . In order to reform this traditional farming system, according to the principle of different harvesting and rotation and the biological characteristics of different fishes, and the different seasons, the composition of pond food organisms and the difference of environmental factors, Law of the new breeding system. The method is: focus on the breeding of silver carp, bighead carp in the first half of the year, focus on farmed tilapia in the second half of the year raise various types of summer flower species, and the "double support