cavefish

Studies revealed that eye loss evolved independently at least three times among the cavefish;

研究显示，在不同品穴鱼间，丧失视力演化过程是独立，而且至少发生了次。

At least some of the mutations responsible for this loss of vision differed between the 29 populations of cavefish known to exist.

目前现存29穴鱼，眼盲亦与这些突变有关，但是突变位置并不相同。