What is the plural of fish?
Nick W is very close (and maybe there, but part of his answer is ambiguous). Both “fish” and “fishes” are proper plural forms, BUT they are NOT interchangeable. “A group of fish of the same species are called fish. Two or more species of fish are called ‘fishes’.” Actually, I believe it is ALWAYS correct to use “fish” for a plural, without regard to whether they are all of the same species or not. But “fishes” MUST refer to different species. (If you need to make a point of the fact that you are listing various species, use “fishes”.) Note that this is a more recent distinction. The KJV Bible (1611) speaks of “five loaves and two fishes” and is not referring to different species of fish. http://www.amonline.net.au/fishes/what/f… http://crofsblogs.typepad.
