Are you an avid fly fishing angler? Then you know the importance of recognizing the various stages of a mayfly’s life cycle. After hatching, the mayfly dun morphs into a spinner, mates, and then returns to the water to lay its eggs and die. A spent spinner on the water’s surface is easy table fare for trout. So be sure to add this essential stage fly to your toolkit, and you’ll experience more success when matching the hatch.