According to the Oxford Dictionary: *fish** noun <http://www.oup.com/oald-bin/#fish_noun>**, **verb <http://www.oup.com/oald-bin/#fish_verb>*noun *(**pl.**fish** or **fishes**) *Fish is the usual plural form. The older form, fishes, can be used to refer to different kinds of fish...
However, I would correct anyone that ever used "fishes".
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