烂鳃病危害苗种和成鱼。发病水温23—30℃左右。病鱼体色黑暗,慢游离群,对外界反应迟钝,呼吸困难,鳃瓣通常腐烂发白,常有带污泥的腐斑,鳃小片坏死,崩溃。防治:1、注意放养密度,不投喂变质、不洁的饵料,及时清除池内污物,残余腐败饵料。2.2％—2.5％食盐水溶液浸洗鱼种10—20分钟。3、1％大黄 Rotten gill disease threatening seed and adult fish. Incidence of water temperature of about 23-30 ℃. Sick fish body color dark, slowly wandering, slow reaction to the outside world, difficulty breathing, gill flap usually rotten white, often with sludge of the rot, gill pieces necrosis, collapse. Prevention: 1, pay attention to stocking density, feeding is not metamorphic, unclean food, timely removal of pool dirt, residual corrupt bait. 2.2% -2.5% salt solution immersed species 10-20 minutes. 3,1% rhubarb