今年夏我市干旱严重,6月初水库蓄水锐减,水位降低1～3米,水库淹没区的水草暴露在水体外,使草鱼无法摄食,只好人工投喂青草。这之后个别精养水库发现有草鱼少量死亡现象,死鱼外观无病变症状。经解剖鳃丝发白,布满粘液并附有少许污物,呈腐烂迹象;肠管充满未完全消化的青草,肝略变大,其它器官正常。初诊时认为是水体急剧减少,加之鲤鱼投饲造成水质恶化,病原菌活跃而引发的烂鳃病,采取食场漂白粉挂篓和泼洒鱼乐安的方法防治,但死鱼反而增加。经分析,死鱼肠管充满食物,说明鱼食欲正常,不是本 In the summer of this year, the city suffered from a serious drought. In early June, the reservoir water drastically dropped and the water level was reduced by 1 to 3 meters. The aquatic plants in the reservoir inundation area were exposed outside the water so that the grass carp could not feed and had to feed the grass artificially. After this, some grass-roots reservoirs were found to have a small number of deaths and the appearance of dead fish showed no symptoms of disease. Anatomical gill filaments whitish, covered with mucus and accompanied by a small amount of dirt, showing signs of decay; bowel filled with incomplete digestion of the grass, slightly larger liver, other organs normal. When the first visit is a sharp reduction of water, combined with carp feeding caused by deteriorating water quality, pathogens active gill caused by gill, take the food basket floating basket and sprinkle fish Le Ann method of prevention and control, but dead fish but increased. After analysis, dead fish intestine filled with food, indicating normal fish appetite, not the present