淡水鱼细菌性败血病 ,渔农俗称“出血病”。此病 1989年在我市个别地区出现 ,1990年开始逐步流行 ,现已成为我市养殖鱼类的头号杀手。此病主要危害鲫鱼、鳊鱼、鲢鱼等多种淡水鱼。每年 3～ 11月均可发病 ,尤以 5～ 9月为发病高峰。【病原体】　主要是嗜水气单胞菌 ,其次是温和 Freshwater fish bacterial septicemia, fisheries commonly known as “bleeding disease.” The disease appeared in some areas of our city in 1989, and gradually became popular in 1990. Now it has become the number one killer of cultured fish in our city. The disease mainly endangered crucian carp, bighead carp, silver carp and many other freshwater fish. 3 to 11 months each year can be disease, especially in 5 to 9 months for the peak incidence. Pathogen is mainly Aeromonas hydrophila, followed by mild