First off, I bet there are some other fish in the lake that you may not know about. Probobly related to carps minnows or suckers. And these are the fish that will be the main food source for a predator like bass. They are spineless which is really important, and they are typically found in more open water environments making them more vulnerable than say, bluegill, whose body shape and size is ideal for escaping big predators in brush, rocks and weeds.
Are you near sacramento? I thought for some reason you were. If so look for sacramento blackfish, sacramento suckers, split tail, pike minnows and dace.
If people concentrated on the important things in life there would be a shortage of fishing poles. ~Doug Larson