RBC,
Pulled this excerpt off a Herpetology website...learned something new here as well...always thought snappers could catch healthy fish...as far as the common snapper (Chelydra serpentina) looks like that may not be the case...as far as the disposition of your resident snapper? If "Homey" were in my pond, I'd leave well enough alone and monitor the fish population...if it starts to decline, get rid of him...however, he may be beneficial in cleaning up the pond a bit...others on the site may have better advice or more experience...
"Snapping turtles are omnivorous. They eat anything they can catch and also various water plants. Small prey are swallowed whole; larger items are torn apart with the front claws and swallowed in pieces. Although there are reports of snappers consuming waterfowl, they do not pose a threat to game species-including fish. Snappers are usually too slow to catch healthy game fish. Sick or dead fish are primarily consumed. Like many other Iowa water turtles, snappers must eat most food underwater; their fixed tongue makes it very difficult to swallow out of water."
