Now, what we're after is rainbow trout.

现在，我们等下要去抓彩虹鳟鱼。

In the wild, rainbow trout eat insects and other, smaller fish.

在野生环境中，虹鳟鱼以昆虫和其它小型鱼类为食。

For the study, the researchers made a plastic rainbow trout with an accurate configuration of flow sensors on its body.

研究人员制作了一种塑料鳟鱼，并在它的身体上安装了非常精确的水流传感器装置。

So, calling a striped bass or rainbow trout a " cold fish" is fine.

因此，将条纹鲈鱼或虹鳟鱼称为“冷鱼”是可以的。