这种病是由细菌寄生鱼体所引起的。它的症状是:病鱼体色发黑,自吻端至眼球间肤色变成乳白色,唇似肿胀,不便活动,呼吸困难;口圈周围腐烂,有时有少量絮状物粘附其上。在池边观察,可见病鱼有“白头白嘴”症状,出水后则不明显。个别病鱼的颅顶和眼眶周围有充血现象,呈“红头白嘴”状,还有个别病鱼体表有灰白色毛耸物,尾鳍的边缘有白 The disease is caused by bacterial parasitic fish. Its symptoms are: diseased fish body color black, from the kiss to the end of the eye to pale skin color, lips swollen, inconvenient activity, difficulty breathing; rotten around the mouth ring, and sometimes a small amount of floc on it. Observed at the pool, showing that diseased fish have “white head and white mouth” symptoms, water is not obvious. Individual sick fish head and eyes around the congestion phenomenon was “red head white mouth” -like, there are individual fish body surface with gray-white hairy, caudal fin white