Like Theo says, without an ongoing forage base from bluegill, they should get real easy to catch. The recommended "recipe" is 1,000 bluegill per acre to provide a renewable food source for predators. Of course, that assumes that you let the BG's go thru a couple of spawns before letting them get hammered. It also assumes that the water is fertile enough to support an ecosystem. Not all are without manipulation. Bob Lusks book "Raising Trophy Bass explains this concept very well. One thing you might try to clear the ponds is to spread OLD hay on the surface at the rate of 10 square bales per acre. One of the Game Biologists on the Mississippi Fishing website recommends that idea. I've never tried it.