There was a bacterial outbreak in the summer which had the fish stressed badly and there was a fish kill on the lake. To the actual magnitude of the kill nobody really knows the exact numbers but the fishery was hurt in my opinion.
As for the carp and shad issue, the carp have always been a problem in the lake for years for as long as I can remember but the shad weren't real prominent until recent years after the DNR starting stocking fish into the lake. Some say this will hurt the fishery as a whole and I agree but the people with the "education" on fishery management are the ones in control and who is to say they don't know what is going on.
We'll just have to wait and see, but my hopes on the general icefishing on the lake this upcoming ice season is no very optimistic.