>>2 When people say it out loud for the plural, I've always parsed it in my head as "fishies" like one little fishy, two little fishies, and "fishes" was only for the verb - "He fishes every day". A little research just now says there are only a few special cases where "fishes" is used for plural "fish". So, you don't have to say "I caught some fishes" because it would be a weird way of saying it, unless (as I just learned) you caught more than one type of fishy.