Checking out some pictures of the Large catfish I have caught out in my 4 acre pond. I noticed a difference beteeen the catfish I caught Large Channel and the 5 lbs cat that my nephew caught. One was it was muddy brown, 2nd it had an underbight with a flattened head, and last tail wasnt forked. Someone has introduced either a flatheed or mor than one flathead into the pond. What do I need to do to fix this problem.