魚是可數名詞還是不可數名詞英語

例句：

The fish I caught was yay big.

我釣的魚有這麼大呢。

Where did you catch the fish?

你在哪兒捕到了這條魚？

I must clean the fish tank out.

我必須把養魚缸徹底清洗乾淨。