产卵地不时被覆盖上油污，令人担忧的是整年的鱼苗都死光光。
The spawning grounds have been covered in oil at times, and there are fears that an entire year's brood may be missing.
在哈德逊河中，拥有变异基因的鱼类蓬勃发展，那些没有变异基因的鱼都已经死光光了。
But in the Hudson, fish with the gene to make the mutant receptor have thrived, while those without it have died out, Wirgin notes.
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