Rainbow shark The rainbow shark is also known as the red-finned carp shark, and is called that because of its resemblance to sharks, however, it is a freshwater fish. Its scientific name is E palzeorhynchos frenatum and it is one of the species belonging to the Cyprinidae family . Where does the rainbow shark live? These freshwater animals are typical of the Asian continent and live specifically in the Lao People's Democratic Republic, Cambodia, Vietnam and Thailand. They generally remain in watersheds, tributaries, and rivers, moving seasonally to flooded forests, marshes, and floodplains. When they are in captivity they stay at the bottom of fish tanks, ponds or aquariums. And they become quite territorial when they re...