Channel Catfish need some very specific spawning structures to successfully reproduce in ponds. Basically they need things they can get in to, like a 5 gallon bucket on it's side or similar things.

Feed will help you grow the fish to harvesting size.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."