Tums I would have to have a lot of info about your ponds to even give you a decent WAG of where they fall on the trophic line/scale. See all the factors in the archive link.

If I understand what you are saying the catfish pond (assuming 2 acre feet of water) completely turns over (exchanges) its water every 2+ days. If so that is a lot. Does it get a plankton bloom ? Assuming good water coming in at that rate and all the food the catfish want (satiation feeding)you could carry 6-800 lbs per acre easy. If aerated then even more.