Do not teach fish to swim.

不要班门弄斧。

Drink like a fish.

牛饮。

fish and chips

炸鱼薯条(英国代表性的大众食品)

This river has been fished too much.

这条河里的鱼被过度捕捞。

I often fish at weekends.

我常在周末钓鱼。