1.病鱼一般头部、背部发黑,尾鳍和背鳍末端发白,有的体表出现红色或白色斑点。鱼体呈现头大尾细的消瘦状态,经常单独在池塘四周漫游,反应迟纯,即使受到惊吓也不立即潜入水中 2.病鱼有痛痒感,在水中极度不安,急剧狂游和跳跃(如食料不足也可引起鱼苗绕池边成群像跑马似游动)。 1. Sick fish generally head, back black, caudal and dorsal fin white, and some body surface red or white spots. The fish showed a large tail thin state, often alone in the pond around the roaming, the reaction is pure, even if not scared to immediately dive into the water 2. sick fish have a sense of itching, extreme anxiety in the water, rapid madness and jumping (for example Insufficient food can also cause fry around the pool into a crowd like horse race like swimming).