Possible isn't necessarily good.
I see the fish he used were of the estuarine variety, mostly, so that helps.
If your water is hard enough to replace the salt, this can work...for awhile.
Once upon a time you could even buy some stuff in the petshop called "Magic Ocean" mix. With it, you could easily mix fresh and saltwater fish in the same tank.
You'd think such a thing would have been pretty cool, but no; there's a reason that stuff is long gone. Those fish just aren't meant to be together
lol, never said it was good, but its possible!
Ah, Magic Ocean, did some reading on that awhile back. Saw a few tanks that had a school of Goldfish with a bunch of Clowns, which looked pretty cool, IMO, but once again, not a good idea.
well..here i am again...on a segment of "trauma center ; life in the ER" a got was brought into the ER with an 8" survival knife buried to the hilt into the top of his head...
the doctors cut out the skull around the blade and removed the knife..then replace the piece of bone..and a few days later the guy went home..no brain damage whatsoever..
so;it is possible to completely survive and recover with no damage from a major knife wound to the brain...now who wants to be my first test subject......lol
much is possible in the world today..and humans are the only creatures sick enough to try these crazy things..and thump their chests like they have done something great..