Rock bass are predatory sunfish. With a relatively large mouth compared to bluegill, rock bass compete similar to crappie. They grow as large as 10 inches, maybe a pound, fun on a fly rod or light tackle. Rock bass reproduce once yearly, so aren't a viable forage fish for bass. A full grown rock bass has a mouth size to compete with 8-10" largemouth bass.
You won't find many hatcheries which grow them, but I find them often in ponds which mingles water with natural sources as creeks, rivers or larger public lakes.
Rock bass are not typically used in pond management.

Teach a man to grow fish...
He can teach to catch fish...