Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations Dealing with worms in Yellow Perch and stunting ?

Many fish parasites have snails as one part of their life cycle. Stocking Redear Sunfish (or perhaps better, Pumpkinseeds since you are in PA and that's pushing the Northern limit for RES) will lower snail-born parasites since they are especially equipped to eat snails.