由于冬季池塘水温较低,鱼类摄食较少,其生长速度也随之缓慢,往往给人们造成一种错觉——鱼“不吃不喝”,放松了管理。导致第二年开春销售放养时,苗种成活率低,鱼遍体鳞伤,病害流行,损失严重。造成病害的主要原因:一是越冬鱼池和越冬鱼体没有严格清塘消毒,使大量的病原体带入越 Due to the lower temperature in winter ponds and the lower intake of fish, its growth rate is also slow, often giving people the illusion - fish “do not eat or drink,” relaxed management. Lead to stocking the next spring sales stocking, seed survival rate is low, the fish covered with bruises, disease epidemic, the loss of serious. The main causes of disease: First, overwintering fish ponds and winter fish is not strictly clear pond disinfection, so that a large number of pathogens into Vietnam