夏季来临，水温逐渐升高，鱼摄食量增加，生长增快，但鱼病也随之增多，影响鱼产量的提高。特别是肥水塘中鱼易得的暴发性流行病（又称细菌性败血症），流行时间长，危害种类广，造成损失大，成为水产业集约化养殖的大敌。笔者所在单位于5月下旬发现有部分鱼塘中的鲢鱼、鲫鱼（ Summer approaching, the water temperature gradually increased, fish consumption increased, faster growth, but the fish disease also will increase, affecting the increase of fish production. In particular, the easy-to-get-out epidemic disease (also known as bacterial septicemia) in fish ponds has a long history of epidemics and a wide range of hazards, resulting in large losses and becoming the enemy of aquaculture intensive aquaculture. The author’s unit in late May found some fish ponds in the carp, crucian carp (