fish的是单数还是复数

　　例句

　　The fish lay thousands of eggs at one time.

　　这种鱼一次产卵数千个。

　　These fish are found in shallow waters around the coast.

　　这些鱼生长在海边浅水水域。

　　I've never been a great one for fish and chips.

　　我从来不是个好吃炸鱼薯条的人。

　　There are about 30 000 species of fish in the world.

　　世界上约有3万种鱼。