The clinical signs of SVC can include darkening of the skin, swollen eyes, abdominal swelling, pale gills, trailing faecal casts and protrusion of the anus.

• 在临床症状上腔静脉，可以包括变黑的皮肤，眼睛肿胀，腹部肿胀，脸色苍白，鳃，拖尾粪便播和凸出的肛门。