In many languages, "meat" roughly equates to "red meat". Fish and fowl are considered different categories. I believe this came about because of a Catholic church ruling that fish did not count against the promise to give up meat during Lent. It also lead to silliness like classing the chigüire / capybara, basically a large swamp-dwelling gerbil, as a fish.
Not just the capybara, but beavers and muskrats too! It actually makes some sense when you consider that Thomas Aquinas' Aristotelianist classification of animals more to do with habitat as anatomy.
