Fish are marine animals from Planet Earth, Mobius and the Special Zone. They can only breathe underwater, forcing them to live in oceans, seas and rivers. They are plentiful in the ocean and are often eaten by all manners of animals, but numbers are dwindling.
Several types of fish have appeared in Sonic the Comic, many of them being background water-dwellers. Varieties like dolphins, sharks and piranhas have bene observed with the following characters:
This list may be incomplete, feel free to finish it.