Never fished the Yak, but if it's got smallies - Lefty's Deceivers, Clouser Minnows, Murray's Strymphs, and the good old Woolly Bugger should catch 'em if anything will. When the water warms up and fish are feeding at or near the surface - just about any type of slider, diver, or popper should work also. Would have a variety between say, size 6 and 1/0. Trout have been known to clobber bass patterns before too