The noun fish is an uncountable (mass) noun as a word for a food substance.
The noun fishes is a plural noun as a word for two or more creatures.
Examples:
This fish's source is the north Atlantic. (singular)
The tiny silver fishes' glint in the sunlight looked like a pool of jewels. (plural)
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Both fish's and fishes' are the plural possessive form for the noun fish.
The noun fish is both a count and a non-count noun, depending on use.
The noun fish is a non-count noun as a word for a substance, a food.
The noun fish is a count noun for a creature living is the sea (or fresh water if applicable).
Example use for count and non-count:
Our group caught six fishes. Our fishes' weight came to twenty-eight pounds.
We have enough fish to feed the whole neighborhood. Good thing, because the barbecued fish's aroma filled the air.
Is fish. The word fish is one of the words that is the same plural or singular. Just like deer.
Fish is singular.
Fish can also be plural if you're referring to many of the same type of fish.
But if you're talking about varies kinds, the correct word would be fishes.