Norm, I'm certainly not the more learned person to comment but the key consideration could be the erratic spawning that Lusk mentioned. It could be that predators can control crappie if they don't erratically spawn for several contigous years. Predators might control a normal yearly boom or bust situation but could become overwhelmed with 2 or 3 years of big crappie spawns. The resulting extra crappie could overwhelm the other denizens spawning and further tip the scales. It sounds like it can be done but might take intense management.
