冬季,当水温在15～20℃时,淡水白鲳幼鱼易患小瓜虫病、白皮病、指环虫病。越冬期间淡水白鲳易患腐皮病、水霉病、车轮虫病等。现将这几种病的症状及防治方法介绍如下:1.小瓜虫病病鱼体表出现大量黏液,严重感染时,在水中呈白云状。防治:鱼种进池前,镜检鱼的体表及鳃,发 Winter, when the water temperature at 15 ~ 20 ℃, the freshwater whitefly juveniles are susceptible to small melons and bug disease, white skin disease, ring worm disease. During the winter, freshwater whitefly is susceptible to rot disease, watery mildew, rickettsia and the like. Now the symptoms of these diseases and prevention methods are described below: 1. Small melon disease fish body surface showed a large number of mucus, severe infection, white clouds in the water. Prevention: fish species into the pool, microscopic examination of fish body surface and gills, hair