FWIW, the only small pond that I work with that currently produces 13+ inch crappie is not fed, the crappie are blacks and the only other species is LMB, and the bass are incredibly dense in numbers. They are everywhere, and probably average 8 inches. My theory is that the LMB greatly control black crappie reproduction, but don't compete very well for available zooplankton resources. The few crappie that we've kept were loaded with phantom midge larvae.
