以捕鱼为生用英语怎么说

"To make a living by fishing" 用英语表达为 "to earn one's livelihood by fishing"。

"Livelihood" 这个词表示生计，来自中世纪拉丁文 "livelode"，意思是生存所需的财物。

例句：

Many families in this small coastal town make their livelihood by fishing.
He decided to leave the city and make a living by fishing in a small village.
Fishing the sea and the fish that provide their livelihood, the fisherman cast their nets.