I'm sure there are other publications, but none come to mind other than Bob Lusk's book on Pond management. You can link to it here
Pond Boss Books. Let's not get ahead of ourselves thinking this is solved. HBG could explain the problem, Crappie may be the problem too, but we don't know yet. Let's either get Nate out there to know for sure or get a lot more info and pics before jumping to any conclusions.
