About the time I made my initial fish stocking, I had a huge snail infestation. I could swipe a dip
net, and catch 20-50 on each swipe. 3 years later, I rarely catch one. I do have RES, though I have
trouble believing they ate that many snails. For a while, I had 3 mallards constantly dabbling
around the banks, but finally ran them off. Or maybe they ate all the snails and decided to leave
on their own. I have a pretty large crawfish population, so maybe they helped too.