depends on the size of cats you want.
shrimp will fill a cooler full of eaters on out river in no time.
Use whole bluegill (2-3") or cut bait (shad or bluegill) if u want to land a big one
i suggest a 3-4oz sinker carolina rigged with a 6/0 gamakatsu circle hook. this will prevent most of the fish you want to release from swallowing the hook.