Quote Originally Posted by Namio View Post
In addition to what Macle said, amphibians do not have scales like most fish do. No amphibians can tolerate salt water due to their semi-permeable skin (salt will dehydrate amphibians pretty quickly), whereas fish do not have a permeable skin. I'll also state the obvious that no fish have limbs with digits like most amphibians do.
Actually, the African Clawed Frog can survive in brackish environments and water with up to 40% salinity. Truly the cockroach of all amphibians.