一、严把种苗关选择优质苗种是预防鳜鱼病害的首要环节。要坚持自繁自育的路子，在繁殖时每隔２年要更换一次亲鱼。亲鱼的选择最好一半是自育的，一半是外面购进的健康亲鱼，避免近亲交配。外购苗种时，运苗前一定要搞好暂养；运输时要轻拿轻放，以避免人为造成机械性伤害而感 First, strict seedling clearance Select high-quality seed is the primary link to prevent catfish diseases. We should adhere to the path of self-cultivation and self-reliance, and replace the broodstock every two years during breeding. The best half of the choice of broodstock is self-employed, half is the purchase of healthy broodstock, to avoid inbreeding. Purchased seed, the transport must be done before holding seedling maintenance; transport should be gently, in order to avoid artificial damage caused by mechanical sense