what are these shells i found fishing

I was fishing in a resovoir and while fishing a c-rig i must have gone over thousands of some sort of shells and i hooked 2 of them. It was a swirl type looking shell not flat like a clam. What are these and what does it mean? Mussel shells maybe? Do bass or any other fish like to be near these. It was about 2 inches long. Thanks for the help.

you got a picture?

sorry no pic

Sounds like an aquatic snail. No hazard to fish, if that is the case. Mussel shells are similar to clam shells.

Andrew

Worried me for a second thinking you had come across some zebra muscles. Luckily the one's you found are too big, Zebras don't get any bigger than a fingernail.