症状：其主要特征是体表皮肤溃疡。感染初期，体色呈斑块状退色，食欲不振，缓慢地浮游于水面，有时狂游或回旋状游泳。中度感染的鱼，鳍基部、躯干部等发红或出现斑点状出血。随着病情的发展，患病组织浸润，呈出血状溃疡。有的吻端或鳍膜烂掉，有的眼球突出，眼内有出血点 Symptoms: Its main feature is skin surface ulcers. In the early stages of infection, the body color showed a patchy fade, loss of appetite, slowly floating on the water, and sometimes go for a swim or swing-like swimming. Moderately infected fish, fin base, trunk and other redness or spotted bleeding. As the disease progresses, diseased tissue infiltrates and presents with bleeding ulcers. Some kiss end or fin film rot, and some prominent eye, bleeding within the eye