The plurals of fish: Fish or fishes

The difference between “fish” and “fishes” comes down to how you’re referring to the aquatic creatures.

Fish and fishes

• Fish
  • This is the most common plural form. We use “fish” in both the singular and plural forms.
    • Examples: I caught a fish. / I caught two fish.
  • It’s used when referring to multiple fish of the same species or a general group of fish.
    • Example: I see several fish in the water.
  • It’s also used when referring to fish as food.
    • Example: Some people eat fish with tartar sauce.
• Fishes
  • This plural form is typically used when referring to multiple species of fish.
  • Example: Scientists say fishes have over 34,000 different species.
  • It’s more common in scientific contexts.

In other words

• If you see a group of trout, you can say “fish.”
• If you see a group of trout, salmon, and bass, you could say “fishes” (though “fish” would also be acceptable).

Therefore, while both words are correct in certain situations, “fish” is the most commonly used plural form.