鱼病防治两点谈防病在先是根本鱼类一旦发病，最早出现的症状就是食欲消失，不能摄食药饵。口服药物很难医治已经发病的鱼类，但为什么池塘中鱼类发病后使用药物可以控制病情呢？这是因为投用的药物对当时尚未发病的鱼起了预防性的保护作用。对于养殖鱼类来说，真正的治... Talk about prevention and treatment of fish disease  Disease prevention First, once the basic incidence of fish, the earliest symptoms of loss of appetite, can not feed bait. Oral medication is very difficult to treat the fish have been infected, but why the use of drugs after the onset of fish pond can control the disease? This is because the drugs administered have a preventive protective effect on the fish that was not yet at risk. For breeding fish, the real treatment ...