预防措施1.稀疏密度越冬的鱼池,放养鱼的密度不能太大,每667平方米放10厘米的鱼种2万~4万尾即可;而对于成鱼池,在冬初可将部分已达上市规格的鱼捕出上市,减少池塘压力。2.改善水质这是管理的关键。改善水质主要就是要注15~20 Precautionary measures 1. Sparse density of fish ponds overwintering, the density of fish can not be too large, put every 10 square meters of 667 square meters of species 20,000 to 40,000 can be; but into the fish pond, in early winter can be part of the Listed fish reach the market, reducing pond pressure. 2. Improve water quality This is the key to management. Improve water quality is mainly to note 15 ~ 20