fish可能是单数也是复数形式，fish的复数形式可以是fish或 fishes，fish用作可数名词时,意为“鱼”,单数形式表示“一条条的鱼”。fish用作不可数名词时意思是“鱼肉”。fish也可按规则变化变为fishes，常表示“许多种类的鱼”。

fish相关习语

1.a fish out of water

离水之鱼；在陌生环境不得其所的人

a person who feels uncomfortable or awkward because he or she is in surroundings that are not familiar

2.have bigger/other fish to fry

还有更重要的事情要做；另有他图

to have more important or more interesting things to do

3.neither fish nor fowl

非驴非马；不伦不类

neither one thing nor another

4.an odd/a queer fish

(old-fashioned, BrE) 古怪的人；有些荒唐的人

a person who is slightly strange or crazy

5.there are plenty more fish in the sea

海里的鱼有的是；还有很多一样好的（人或事物）

there are many other people or things that are as good as the one sb has failed to get

6.a big fish (in a small pond)

（小圈子里的）大人物

an important person (in a small community)