Fish Versus Fishes

Definitely fishes!
Fish: for dinner. Photo via Wikimedia Commons under Creative Commons license. 

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.