Alligator snappers will eat some of your fish. They use their tongue like a lure to attract them, then snap, like a mouse trap. That being said, Alligator snappers are getting pretty scarce so I would try to catch and move him. Regular snappers live in my pond until I get a craving for turtle soup. I treat them like the catfish in my pond. Only take out what I (or family/friends) want to eat.
