fishes

[Unregistered]

I dont understand the different between fish and fishes

there are many fish in the sea
there are many fishes in the sea

fishes= many kinds of fish right

there are always many types in the fish so should fishes be corect?

[Philly]

It is fairly unusual to use the word 'fishes'. You should use 'fishes' only if you specifically want to refer to types of fish, usually in a very specific location. To me, your sentence seems a little too general to use 'fishes'.