简单异尖线虫[Anisakis(Anisakis)simplx]的幼虫,至今仅在海鱼体中发现,虫体为长圆筒形。前端钝圆,食道接着有大而呈圆筒形的胃。尾短,末端钝圆。生活时呈乳白色。据报道,简单异尖线虫的幼虫为刀鲚(Coilia ectenes Jordan et Seale)体内常见寄生虫之一。一般寄生在腹腔和内脏中。据我们观察,该虫体对刀鲚的感染率较高,感染强度较大,对鱼体的生长有一定的危害。刀鲚离水后不久即死亡,但寄生在刀鲚体内的简单异尖线虫却可生存一段时间。由于该种属海洋寄生虫,对盐度忍受力较强。但 Larvae of the simple Anisakis (Anisakis) simplx have so far been found only in marine fish bodies, which are long cylindrical. Front blunt, esophagus followed by a large cylindrical stomach. Short tail, blunt end. Milky white when living. Larvae of the simple Anaxis nematodes are reported to be one of the common parasites in the body of the Coilia ectenes Jordan et Seale. Generally parasitic in the abdominal cavity and internal organs. According to our observation, the infection rate of the worm on the knife is higher, the greater the intensity of infection, the growth of fish have a certain degree of harm. The knife 鲚 died shortly after leaving the water, but the simple Anchilles parasitic in the knife 却 body can survive for some time. Due to the species of marine parasites, salinity tolerance. but