Signature Tyer Paul Procter's Active Mayfly Dun is an excellent pattern to fish when mayfly—Ephemera Danica—are hatching and the trout are keyed in on the duns. While many of us are used to presenting duns with a dead drift, as Paul share's in this video sometimes a little movement can really help your fly stand out in the drift. That's why he designed his pattern so it can be “active” if you want to give it a little twitch or lift. If you plan to fish the mayfly, this is a pattern you absolutely cannot be without.