During the winter they will often take smaller baits. If you found them in a prticular area, they are likely staying in that areas as in the winter they don't move as much. But they still feed.
Are you talking channels? A piece of trout, bluegill, chicken liver or many other things should attract them in and they should take the bait.
If you are talking bullhead, worms have always worked best for me though we have also caught them on small pieces of chicken liver.