"Fishes" is an alternative plural in English. E.g. "The parable of the loaves and fishes". Yet not accepted. And apparently not reportable either.
I did wonder whether fishes would be accepted. You use "fishes" instead of "fish" if there is more than one kind of fish, rather than multiple of the same kind
JonhkienVi - That seems like a good question. Let me look into it. I will try to respond once I find out. However, it seems like it would be something related to phonetics in terms of having to prolong the sound of the "s".
De vis = the fish
De vissen = the fish/fishes