I think he can bring the fish in states.. Well my experience is different everytime I go to Anchorage, Alaska I always bring salmon when I go back here.. what we do is my uncle will froze the fish hard as a stone so that it wont go bad... as far at the imigration, just stated that he has fish with him.. It would be crazy if its not allowed to bring fish in the states if we are able to their fish in ontario...
or better call imigration to make sure 100%
gudluck!!...
bfisher