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鲤鱼吞下被寄生虫幼虫感染的剑水蚤,便患了嗜子宫线虫病(病原是Philometra lusiana).幼虫从鱼的肠子钻入体腔,进入肝、肾和其它器官,在那里发育并于第14～15天完成第三次蜕皮(第一、二次蜕皮在剑水蚤的体腔里进行).然后,移行到鳔壁,于第18～21天再次蜕皮并于30～40天形成雌虫和雄虫.雌虫受精后移动到皮肤的磷状窦内.从感染时起到雌虫产出幼虫为止,鱼体内该寄生虫的寿命为11～12个月.雄虫只寄生在鱼鳔内(K.O.?,1970;等).
The carp swallowed the sword daphnia infected by parasitic larvae and developed nematode nematode (pathogen, Philometra lusiana). The larvae dig into the body cavity from the intestine of the fish into the liver, kidneys and other organs where they developed and developed The third molt was completed 14 to 15 days (first and second molt were carried out in the body cavity of Sword Daphnia), then migrated to the stomatal wall, re-molted on days 18-21, and females formed on days 30-40 And males.Female fertilized after moving to the skin of the phosphorylated sinus.From the time of infection to the female larvae, the life of the parasites in the fish body is 11 to 12 months.Macro parasites only in the mandarin fish ( KO ?, 1970; etc.).