Maybe that is partly due to them be too successful at spawning in smaller BOW's and less successful in bigger BOW's?
I can imagine that in a large BOW, predators gradually increase in number until the crappie are kept in check. In a small BOW, I imagine the predators are highly vulnerable to the crappie. I imagine crappie of all sizes eat everything from eggs right on up to 6" young of the predators. You would be forced to not take out any big LMB, and do plenty of crappie fishing.
