whats best water type

  • We are currently upgrading MFK. thanks! -neo
i would have to say no.
while there are a number of "freshwater" fish that are capable of going between salt and freshwater, i don't think that cyprinids are one of them.
 
Why do you want to put freshwater fish in saltwater?
 
If the referenced "black fin sharks" are Hexanematichthys (formerly Arius) seemanni, aka "Columbian shark cats" or "white-tipped shark cats", then the answer is yes:

http://www.planetcatfish.com/catelog/species.php?species_id=700

This species is a member of the only SW catfish family, Ariidae. It occurs in FW and brackishwater as juveniles and requires heavily brackish water to SW as an adult.

None of the other species are even remotely related. As mentioned, they are FW cyprinids and shouldn't even be kept in brackish conditions.
 
i agree, why would you want to acclimate fresh water fish to salt, just set up a fresh water tank if u want them.
 
MonsterFishKeepers.com