we had several in our farm pond in TN for years....a few of them were huge (probably 30-35 #). My uncle treated them like pets and insisted they always be released if caught (which they were on a relatively regular basis). He fed them dog food, would fill a metal coffee can with the food and walk out on the dock, bank the can against the pilings a few times then throw the food out. After a while, you could just bang an empty coffee tin and those catfish would come swimming up, circling the dock.