红点病主要危害日本鳗,欧洲鳗不易感染。该病在含盐分的水中生存期相当长,但是已发病的鳗鱼如移入淡水,鱼体内仍存活病原菌。该病流行水温为12～25℃,水温高于30℃能抑制该病的发生。一、症状病鱼体表各处点状山血,尤其以下颌、鳃盖、胸鳍基部及躯干腹部为严重。病鱼开始出现上述症状后,一般1～2天内就死亡。如果将这些病鱼放入容器内,鱼就激烈游动,在接触容器的部位急速 Red dot disease is mainly endangered Japanese eel, European eel is not easy to be infected. The disease has a long survival time in saltwater-containing waters, but pathogenic eels, such as freshwater, survive in the fish. The disease prevalence of water temperature of 12 ~ 25 ℃, water temperature above 30 ℃ can inhibit the occurrence of the disease. First, the symptoms of sick fish body surface point mountain blood, especially in the jaw, gill cover, pectoral fin base and trunk abdomen is serious. Disease fish began to appear after the above symptoms, usually within 1 to 2 days died. If these diseased fish into the container, the fish fierce swimming, contact with the container parts rapidly