Plural of Fish: The best way to Accurately Write Fish in Your Tales

Here’s a question for you: what’s the plural of fish?

English is a pretty convoluted language. Even when things seem straightforward, exceptions pop up to turn regular rules upside down.

Today we’ll look closely at the word fish and verify the correct plural use of it.

Whether or not you’re writing a rhyming children’s book like One Fish, Two Fish, Red Fish, Blue Fish or a literary novel staged on the sea, understanding the proper use of this word—like all good grammar—can strengthen you’re writing.

Learn good grammar without depending on tools like Grammarly with bite-sized posts on simple grammar rules like this one.

Normal Pluralization

In general, English pluralization rules are pretty simple: just add an “s.”

My friends and I walked our dogs to the pond, where we saw a few turtles and many fish.

Friend, dog, and turtle all become friends, dogs, and turtles.

And then there’s fish.

The Plural of Fish

An individual fish is just that—a fish. One scaly animal swimming in the sea (or river, or pond, or fishbowl).

Here’s the thing: if you have two scaly animals swimming in your fishbowl, you have two fish. No matter how many fish you have, the word “fish” doesn’t change.

It doesn’t matter if you’re talking about the a school of fish or the number of fish in that school, the plural form of the word fish is fish.

The plural of fish is . . . fish.

Its plural form is the same as the singular—most of the time. I say most of the time because this rule sometimes broken and more regular plural forms are also used for some of these words.

The plural for fish isn’t the only case in the English language where the singular and plural forms are the same word. The plural of moose, for example, is moose. The plural of deer is deer. The plural of sheep is sheep.

Why, then, do we sometimes hear the word “fishes”?

Fish vs. Fishes

Unlike “sheeps” or “mooses,” the word “fishes” is a real, grammatically correct English word. It doesn’t generally come into play in regular conversation, but it’s a helpful term in biology.

The plural of fish of different species is fishes.

Remember that example from above of the fish in the pond? In general, we’d say we saw fish.

Maybe, though, we saw multiple species of fish. Imagine you’re looking at multiple freshwater fishes—some bass, some carp, and some minnows—and want to refer to them as a collective whole. In this case, we could say we saw fishes.

Say it again: you can use the word fishes when referring to different kinds of fish.

Fishes: Plural vs. Possessive

There’s one more reason you might hear the word “fishes” tossed around: when it’s used in the possessive form.

To indicate one fish has something, we add an “’s” to the end. For example:

I have one goldfish in a bowl. My fish’s eyes are big.

To indicate that multiple fish have something, though, we have to pull out the “fishes” again:

Sarah has three goldfish in a bowl. Her fishes’ eyes are even bigger.

In this case, we use “fishes’” no matter how many types of fish there are.

Fishy Rules of Pluralization

Throughout the history of the English language, we’ve pulled in words from all kinds of different sources and integrated them into regular language. For the most part, we’ve been okay about standardizing things—generally, to make something plural, all you have to do is add an “s” to the end.

Sometimes, though, we mix it up with convoluted exceptions, and then we end up with “moose,” “sheep,” and . . . “fishes.”

What can I say? English grammar is a fishy business.

Have “fish” and “fishes” ever tripped you up? What other convoluted English grammar irregularities do you find interesting? Let me know in the comments.


Two characters are going scuba diving. One is familiar with the correct use of “fish” vs. “fishes,” and the other has never seen a fish in their life. Write their story for fifteen minutes. When you’re done, share your writing in the comments, and remember to leave feedback for your fellow writers!

Alice SudlowAlice Sudlow has a keen eye for comma splices, misplaced hyphens, and well-turned sentences, which she puts to good use as the content editor of The Write Practice and Short Fiction Break literary magazine. She loves to help writers hone their craft and take their writing from good to excellent.