I would agree that stocking flathead catfish isn't the best idea for many ponds for stunted fish control. But the fact that he was probably harvesting his flatheads out after a few years probably helped with the long term benefits of the BG, LMB, and crappie. And being as though bullheads are one of the favorite foods for flatties (and least desirable fish in Mark's pond) I would suspect that the bullheads became the major flathead food source for at least a few years.
I would have to agree with the flathead's huge mouth gape though. Using 10" suckers for bait in Iowa are no match for just a 15 pound flathead.
