鱼类卵甲藻病俗称打粉病、白鳞病 ,发病时间长 ,感染快 ,死亡率高。病鱼体表粘液增多 ,背鳍、尾鳍及背部先后出现小白点 ,白点逐渐蔓延至尾柄、身体两侧、头部及鳃内 ,白点之间有充血的红色斑点。病鱼食欲减退 ,游动迟缓 ,呆在水面 ,体表白点逐渐连接成片 ,像外裹一层白粉 ,并 Fish egg dinoflagellate commonly known as powdery mildew, ichthyosis, the onset of a long time, infection, high mortality. Disease fish surface mucus increased dorsal fin, caudal fin and the back has a small white spots, white spots gradually spread to the caudal peduncle, the body sides, head and gills, white spots between the congestion of the red spots. Diseased fish loss of appetite, slow swimming, stay on the surface of the body gradually into pieces of white spots, like the outer layer of white powder, and