一、鲤鱼春季病毒病:(Spring Viremia of Carp):SVC病毒是已知流行于欧洲的鲤鱼类病毒,鲤鱼发病于13～20℃春季水温上升时期,17℃发病最盛,当水温超过20℃时则减弱。稚鱼和幼鱼不患此病。鲤鱼一旦患上此病,2～3周死亡率达80～90%。病鱼喜集中在注水口,呼吸迟缓,横卧水底,不久身体歪斜,浮出水面,病鱼体表 First, the carp spring virus disease: (Spring Viremia of Carp): SVC virus is a common carp virus known in Europe, the incidence of carp in the spring water temperature rise of 13 ~ 20 ℃ period, the highest incidence of 17 ℃, when the water temperature exceeds 20 ℃ Weakened. Juveniles and juveniles do not suffer from the disease. Carp once suffering from the disease, 2 to 3 weeks mortality rate of 80 to 90%. Sick fish happy concentrated in the water inlet, breathing slow, lying underwater, soon askew the body, surfaced, sick fish body surface