鱼是可数名词还是不可数名词英语

例句：

The fish I caught was yay big.

我钓的鱼有这么大呢。

Where did you catch the fish?

你在哪儿捕到了这条鱼？

I must clean the fish tank out.

我必须把养鱼缸彻底清洗干净。