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Fish: The food you buy at a seafood counter
Fishes: The animals, both individuals and species, primarily in the classes Chondrichthyes (sharks and rays) and Osteichthyes (bony fishes), that live in the water column. As in, “There are a lot of fishes on that reef…. and a lot of types of fishes.”
On the other hand, an individual fish is a…fish.