The FDA and a company called AquaBounty performed some incredible feats of misdirection to get fast-growing, genetically modified salmon approved for consumption in the United States.
First, the FDA released it's environmental assessment just before Christmas, when everyone was preoccupied with the holiday.
Second, the FDA classified the man-made "species" not as an animal, but as a drug in order to expedite the approval process. It's faster to get drugs approved in the United States than it is genetically modified foods. (AquAdvantage salmon have a cluster of genes from two other species of fish that make it grow much faster than natural salmon -- the fish above contrast natural salmon with the lab-engineered variety.)
And third, in order to get approval, the FDA needed only plausibly predict "an extremely low likelihood" that AquAdvantage salmon would affect "the environment of the United States." Sure, it could affect the environments of other countries and the Pacific Ocean if or when the salmon escape and breed with wild salmon -- but that's not the United States, so no worries.
The salmon eggs will be produced in Canada, and the fish raised in tanks in Panama in order to avoid affecting "the environment of the United States."