网箱养鱼，鱼病发生情况与池塘不尽相同。一是由于放养密度大，一旦发生鱼病，感染、蔓延快，短时间内危害严重。二是由于箱内外水体不断进行交换，用药比较困难，药物难以达到防病治病所要求的药物有效浓度和作用时间。因此，网箱养鱼的鱼病防治不宜照搬套用池塘静水环境中防 Cage fish, fish disease and the pond is not the same. First, due to stocking density, in the event of fish disease, infection, spread quickly, a serious harm in a short time. Second, due to continuous exchange of water inside and outside the box, the medication is more difficult, difficult to achieve effective drug prevention and treatment of drug concentration and duration of action. Therefore, the prevention and control of fish cage disease should not be copied in the pond water environment prevention