But they feed on another kind of fish called the humpback chub.

但它们以另一种叫座头鲢食。

The chub almost disappeared years ago.

座头鲢几年前几乎消失了。

You've got your pups, your cubs, your chubs.

小基佬 幼兽基佬 白鲑基佬。

Brian Healy has worked with the humpback chub for more than 10 years.

布莱恩·希利研究座头鲢有10年。

The humpback chub is an ancient fish that is native to the river but is threatened.

座头鲢是一种古老，原产于科罗拉河，但现在属于濒危物种。

However, with water levels dropping, the invasive fish have gotten past the dam and closer to where the chub remain.

然而，随着水位下降，这些入侵类经越过了大坝，更靠近鲢栖息地。