Here are a list of fish that can adapt to fresh, salt, and brackish water environments. I do not see how it is cruel to keep an Epinephelus lanceolatus, yes, the giant jew fish, grouper, that gets over 10 feet in the wild in a fresh or brackish water fish tank.

Oreochromis niloticus and most other oreochromis sp.

Lates japonicus, calcarifer

Salmonidae family all of the, trouts, chars, salmons


Parachromis-guapote from Central America


Atractosteus spatula-alligator gars


Acipenseridae-sturgeons of most species


Poeciliidae-guppies, mollies, swordtails, platys


many puffers, monodactylus, scatophagus, and many more.





There is nothing cruel about it, since we breed millions of chickens and kill them for food, we slaughter cows, and pigs., we cut dogs tails off, we shoot deers and bisons. Its no different than people who eat snakes, or dogs, or cats, just because we consider some as pets and it gave them a higher value.