Even if you release your fish back to the sea, they're most likely to not survive for long because most parts of U.S. are in the temperate zone, not tropical. Most of them would die immediately upon release from a thermal shock (of course, you won't be acclimating your fish when you try to release it). Even if they survive, they will not cause much damage...since there are many natural predators out there.........also minimal chance of reproduction....because of no same species of opposite ---.......etc......Anyway, bottom line...never release your livestock to the ocean unless they were locally collected.....