The Mahogany Dun is an important mayfly that can be found throughout the entire USA. There are several species of Mahogany Duns and hatch times depend greatly on the part of the country they are found in. Some species of the mahogany dun hatch during both the summer and fall of the year with the larger hatches usually occurring later in the year.
Although Mahogany Dun nymphs spend much of their lives in runs and riffles, they migrate to the quiet margins as they mature. Thus most hatches occur in slow, almost slack water near shore. After the hatch, the wings of the Mahogany Dun dry fast, so the dun can leave the water soon thereafter.
Since the Mahogany Duns are hatching near the banks where the water is calm, shallow, and clear, you can often see the trout rise lazily to sip up the duns almost at your feet. This feature makes fishing with the Mahogany Dun exciting.
Almost all anglers will agree that the presentation should be a down and across enabling you to get the drag free drift. Also, the trout will usually see the fly before it see you. In some instances, however, an up and across presentation will work especially if the water is smooth and slick. Remember to remain hidden since your target is likely to be near shore. Long light leaders 5X or even 6X may be necessary to approach the trout without them spooking.
On occasions, Mahogany Duns will emerge just below the surface; in that instance you may consider using an emerger fly pattern or a nymph pattern without weights. Irrespective of where they are found you will find our “Perfect Fly” imitations very effective.