will.isaac,
I have read several musky predation surveys that have been conducted in the northern states (I think an Illinois study was the closest to our fisheries). In all of the those studies, it was found that muskies primarily feed on non-gamefish species. Will they eat crappie, bluegill, bass, etc? Of course. But they are not solely feeding on those species, like so many people seem to believe. I have never seen a study that has been conducted in our waters, but I would bet the house that shad are the "evil" muskies primary forage.
I haven't been out in a while, but I highly doubt the lake has turned. This seems to have been a very tough year for most people I talk to (especially the people in my boat, me included). I wish I knew why they have been so fickle this year.
Kevin