I really have no idea!?!  Maybe a bad spawn a few years ago?  I remember in 2009 and 2010 I caught several fish over 20 inches.  Still lots of dinks, but seemed like I could count on catching at least 1 toad per trip.  The last few years havent been nearly as good with the big bass....but then again ive been targeting crappie mostly, but I still caught a few nice ones a year.  I wish we could keep some of those 12" fish...I feel like there is an overpopulation of them, even with all the forage.