生产实践证明,冬放鱼种成活率高。管理措施为: (一)保水深度。越冬塘水要保持在2米以上,最少不低于1.5米。深水增加了越冬塘空间体积,降低了越冬鱼种密度,形成了塘水热成层。一般深水层水温高于表水层2到3℃,这对鱼种越冬极为有利。 (二)投饵施肥。冬季成鱼塘,天气晴暖时,鱼类仍能摄食,有时摄食量还很大,因此要适当投饲,一般每天投喂一次,日投量 Production practice has proved that winter fish stocks high survival rate. Management measures are: (A) water retention depth. Winter pond water to maintain more than 2 meters, at least not less than 1.5 meters. Deep water increased the volume of winter ponds, reducing the density of overwintering fish species, forming a thermodynamic stratification of pond water. General deep water temperature is higher than the surface water 2 to 3 ℃, which is extremely beneficial to the winter species. (B) feeding fertilization. Into the winter ponds, when the weather is sunny, the fish can still eat, and sometimes food intake is still very large, so to be properly fed, generally fed once a day, the Japanese vote