If Michigan duck weed is like Virginia duck weed, just fish the lake like it isn't there. That weed is not a heavy cover like milfoil, hydrilla, pads, or standing timber. The little floaters can be moved about easily so you can use Tx rigged baits, jigs, etc. Horizonal baits may be a problem such as spinnerbaits or crankbaits since they will catch on the line and drag down to the lure.