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(一)烂鳃病1.发病症状。由粘球菌引起的细菌性疾病,鳃丝腐烂,严重时鳃软骨外露,并且常带有污泥,鳃盖内侧表面充血,中央表皮常被腐蚀成一个圆形透明的小洞,俗称“开天窗”。由真菌引起的鳃霉病,病鱼鳃部呈苍白色,有时有点状充血或出血现象。该病常使鱼暴发性地死亡,镜检会发现鳃霉菌丝。2.防治方法。可用0.8毫克/升硫酸铜与1毫克/升漂白粉混和溶液浸洗病鱼15～20分钟,或用0.15毫克/升苯扎溴胺溶液
(A) gill disease 1. The onset of symptoms. Mycosis caused by bacterial diseases, gill filaments rot, severe gill cartilage exposed, and often with sludge, gill cover the inside surface of the congestion, the central epidermis is often eroded into a circular transparent hole, commonly known as “open skylight ”. Gill mold caused by fungi, sick fish gills were pale, and sometimes punctate congestion or bleeding. The disease often causes the fish to die fatally and the gliosis can be found by microscopic examination. 2. Prevention methods. Available 0.8 mg / l copper sulfate and 1 mg / l bleach mixed solution of diseased fish immersion 15 to 20 minutes, or 0.15 mg / l benzalkonium bromide solution