One thing strikes me. Snails need vegetation. If you have obnoxious amounts of submersed aquatic plants, you should consider limiting it. Limit habitat, you limit the creature. Try the yellow perch. I think Cecil may be onto something. In the south, we use redear sunfish, also called "shellcrackers" because they feast off snails. However, I don't know how well they will live in Iowa. I know this...one of my clients in upstate NY bought some last summer from a supplier in Ohio. What I didn't learn though is, if those red ear were raised in Ohio. Some of the shellcrackers are still in small hatchery type ponds, under 10 inches of ice. Some were brought inside, to the warm surroundings of a 5,000 gallon tank. Will report back to everyone when the ice is gone.


Teach a man to grow fish...
He can teach to catch fish...