秦岭山区虹鳟寄生三代虫一新纪录

记述了秦岭山区寄生于虹鳟的单殖亚纲一新纪录种：细鳞鲑三代虫Gyrodactylus brachymystacis Ergens，1978，比较了其与我国东北寄生于虹鳟的细鳞鱼三代虫Gyrodactylus lenoki Gussev，1953的区别。初步判断其来源可能一是通过水源来源于秦岭的细鳞鲑，另一种是通过早期虹鳟的引进带人的，其真实的途径及其对环境的风险性还有待于进一步研究。

A Newly Recorded Species of Gyrodactylus(Monogenoidea)in Oncorhynchus mykiss (Walbaum)from Qinling Mountains

In this paper a newly recorded species belonging to Monogenoidea in Oncorhynchus mykiss from the Qinling Mountain is described, namely Gyrodactylus brachymystacis Ergens, 1978. In addition, the diagnoses of G. lenoki Gussev, 1953 and G. brachymystacis are given as well. How and when this particular stock of fish first acquired the parasite? One likely possibility is established that they originated from wild fish in the Qinling watershed via the intake water supply, indeed, locals report that the Manchurian trout, Brachymystax lenok (Pallas), the only known natural host of G. brachymystacis , is present, albeit rare, in the river and thus a potential source of the infection. The another possibility is that they originated from other plase introduced into Qinling Mountain region via the delivered to the facility as fertilized eggs which fetched in early years.