We had a pond behind our house when I was a kid. The pond was around two acres, maybe slightly larger, and averaged 6-8 feet in depth. There were only LMB and crappie. There was a very high number of bass to start with and they grew like crazy. It was not uncommon to catch 20-30 fish weighing from 2-8 lbs in a couple of hours. The crappie also became heavily populated and HUGE! It was the best of both worlds for several years. On a few occasions we would catch 150 crappie a day, all of good size and up to 2.5 lbs. With the heavy fishing pressure on the crappie and little culling of the bass, it seemed to work well.....then a drought hit and the pond went dry. I sure would have liked to have seen how it all played out, however, I'm not brave enough to try the LMB/Crappie combo in my own pond! It must have somehow just been a unique situation that worked perfectly for that pond..?? well, until it went dry.