Jim Riedel, owner of Waterstreet Custom T-Shirts and Art Gallery in Rockport, told me that the crab fly is his go to fly when sight casting to reds. He says to cast the fly near the red, wait, don't move the fly for a few minutes. If the red doesn't pick up the fly, give it a couple of quick jerks. Jim is the type of fellow that when you meet him, you know you have made a friend and he really gets excited about fly fishing. He swears by the crab flies and got me started tying them.