If you are really desperate - some guys will flyfish for perch. Look for submerged weed beds 8-20 deep. Use small wooly-bugger type patterns - try olives, reds and yellows. You might also try throwing some larger streamers for bass around some structure if you have access to a boat.
I thing most of the trout, and there are some very large ones, in LW get caught by the trollers on spoons and such.