By analyzing the relationship between the species of Gyrodactylus and the same fish, the results show high host specificity i.e. majority of the hosts only have one species of the Gyrodactylus.

• 分析同一种寄主上所寄生的三代虫种类之间的关系，显示大部分寄主只寄生一种三代虫，体现出了三代虫很强的寄主特异性。