How big and what types of turtles?
Large snapping and shoftshell turtles we used to "jug" them. A plastic milk jug some trout line cord and a big heavy hook and some nasty bait (like jugging catfish on a river). Toss in the pond and check daily. Sooner or later you will find the jug bobbing or moving around.....unless you got catfish, you got a turtle! Not sure of the legality of this method, but it's how we pulled big turtles out of ponds in my area. We eat'em! My grandfather would cause an accident driving down the road to slam on the brakes to pick up a big turtle in a ditch or crossing the road.
Maybe you need to call "the turtle man"!!!!!
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This fool gets in the water and pulls them out by hand!!!!! Only in KY!!!!!