Rabbi Shmuel Maybruch has written a comprehensive piece on why AquaBounty's AquAdvantage Salmon is indeed kosher. "AquAdvantage salmon (AAS) raises potential kashrus concerns. The genetic material inserted into the Atlantic salmon comes from two fish, the related Pacific Chinook salmon – which is kosher, and the ocean pout – an eel like fish that is not kosher. Does using material extracted from a non-kosher fish render the modified AquAdvantage salmon as non-kosher? A closer examination of scientific and halachic background provides bountiful evidence to suggest that the new salmon has no kashrus concerns at all." Read article here.