You will see lots of them in the fish's stomachs when filleting them and in your live-well when the fish spit them out.. I have played around with traps and caught a few, mostly smaller ones. Never caught enough to make it worth cooking them up for us. If you walk along shoreline with good rocky structure at night with a flashlight you will see a few. Many years ago we used to see more. I think the smallmouth keep them in check pretty good and if they don't stay well hidden they will end up in the belly of a fish LOL, Judging by how many do end up in the stomachs of fish there are plenty in the lake. I think it either the variety that is there of the pressure the fish put on them but the ones I see and have caught are small by comparison to other lakes we pursue them. Wayne can answer that I am sure.