I am in the very early stages of my crappie pond experiment and have learned a couple of things about a minnesota dug out pond. In my experience, and knowledge gained from the PB experts, if you don't monitor and harvest accordingly those BC will absoletley over reproduce their environment. The growth will stop and the BC will be paper thin (neighbors pond did just that). I remove every BC I trap and catch. I have gotten real good at cleaning 6" crappies grin IMHO I think 12"-14" BC are possible in a 1 acre pond. Its just more "work". What are you using as their primary food source?