fish是单复数同形。当fish中文翻译为“鱼”“鱼肉”、“双鱼座”、“接合板”、“鱼雷”等意思时，其复数形式还是fish；当fish指鱼的种类时，其复数形式为fishes。
fish的中文意思及用法介绍
1、作为名词时，意为鱼;鱼肉。
例句：They caught several fish.
他们捉到了几条鱼。
The list of endangered species includes nearly 600 fishes.
濒临灭绝物种的名单中列有将近600种鱼。
Fish stocks in the Baltic are in decline.
波罗的海的鱼类资源逐渐减少。
I was chatting to an islander who had just caught a fish...
我正在跟一个刚刚抓到一条鱼的岛民聊天。
Does dry white wine go best with fish?
吃鱼时喝干白葡萄酒是最佳选择吗？
2、作为动词时，意为钓鱼;捕鱼;在…捕鱼(或钓鱼);摸找。
例句：You can fish for trout in this stream.
你可以在这条小溪钓鳟鱼。
The trawler was fishing off the coast of Iceland.
拖网渔船在冰岛沿海捕鱼。
Let's go fishing this weekend.
咱们这个周末去钓鱼吧。
They fished the loch for salmon.
他们在狭长海湾里钓鲑鱼。
She fished around in her bag for her keys.
她在口袋里摸找钥匙。
Brian remembers learning to fish in the River Cam.
布赖恩记得曾在剑河学过钓鱼。
He didn't want to create the impression that he was fishing for information...
他不想让人觉得自己是在套话。
They were not allowed to fish in our territorial waters.
不允许他们在我国领海捕鱼。
Today one-third of the people on Greenland earn their living in the fishing industry.
今天格陵兰岛上有三分之一的人在捕鱼业中谋生。
