Snapping turtles are quite smart, evolution wise. They don't show themselves much, can stay hidden underwater for hours, can detect foot vibration in water ages before you get close to the pond...
Turtle traps can winkle them out easy, at an average speed of about one per hour
You may want to assess what problems they really present, adult snapping turtles are by and large vegetarian, scavenging bugs, crustaceans, snails and dead fish is about the worst they feel inclined to do, healthy fish are usually way too nimble for them in water
Regards, andy
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