Funky,
Do you also fish for the BG?
Lots of people on the forum have a problem with BG overpopulating without enough LMB as the top predator. Are your CC keeping your pond in a decent balance?
Also, are the CC reproducing in your pond, or are you just raising the original catfish that you stocked?
Congrats on your 31" CC, sounds like a good "eatin' size" to me!