Fish the Blue Wing Olive Baetis one on one to rising trout when the baetis hatch is on. If the hatch is sparse, fish these on 6X along the grass beds in spring creeks and on the tails of the pools on freestone streams. A staple hatch for most trout, this historic fly pattern has been fooling trout for longer than most of us have been alive. A stiff, spade hackle tail, tightly dubbed body and pullet-feather wings (good ones are hard to come by) surrounded by a stiff hackle collar assure proper imitation.