1·烂鳃病病原粘球菌。症状病鱼体色发黑,离群独处,废食。鳃丝腐烂带泥,鳃盖内侧表皮充血,常腐蚀成圆形透明小洞,俗称“开天窗”。草鱼鳃瓣感染粘球菌后,病变区组织呈现不同程度的腐烂、溃疡和侵袭性出血。青鱼、草鱼、鳙鱼等养殖鱼类都可发生此病,尤以危害草鱼为主。水温15℃ 1 · gill disease pathogenic Mycoccus. Symptoms Fish body color black, isolated, waste food. Gill filaments rot with mud, gill cover the inside of the epidermis congestion, often cornered into a circular transparent hole, commonly known as “open skylight.” Grass carp gill flap infection Mycoccus, the lesion showed varying degrees of tissue necrosis, ulceration and invasive bleeding. Grass carp, grass carp, catfish and other cultured fish can occur in this disease, especially the grass carp-based hazards. Water temperature 15 ℃