The plural of fish is fish.
While this might seem unusual, it's actually a common quirk of the English language. Some nouns have the same form for both singular and plural.
Here are some other examples of words that have the same singular and plural forms:
- sheep
- deer
- series
- species
However, it's important to note that if you're referring to different types of fish, then the plural becomes fishes.
For example:
- "I saw a fish in the pond." (One fish)
- "There are many fish in the ocean." (Many fish of the same type)
- "The aquarium has many fishes from different parts of the world." (Many different types of fish)