Description
The Mayfly Dun: The Moment of Truth (The Crucial Stage)
The stage of the newly hatched adult Mayfly is called the Dun. This is arguably the most critical phase for the fly angler. Depending on surrounding circumstances such as temperature, wind, and weather, the time it takes before the Dun is able to fly away from the surface will vary.
These newly hatched Mayflies are often an easy and vulnerable target for the fish, and many will end up in Mr. Brown Trout’s stomach. When the hatching is frequent, many fish species might become selective and only feed on Duns.
Our Commitment: Perfect Imitation
Our commitment is to provide imitations of the real insect where the fly has the right shape, size, proportions, and colours, and, not least, leaves the correct print on the surface of the water.
This imitation of an adult mayfly in the Dun stage possesses all the right proportions and properties. It looks natural, feels natural, and fish will eat it.
Our Large-Winged Dun Imitation Features:
- Correct Surface Print: The imitation creates the precise silhouette on the water film that triggers the selective fish.
- Optimal Vulnerability: Designed to mimic the wing-drying, vulnerable Mayfly just before take-off.
- High Quality: Exact proportions and colours perfectly match the natural insect.
Recommendations for Best Results
We do recommend you to use a J:son Swivel for all your fly fishing. However, it is necessary to use a J:son Swivel whenever you are fishing a J:son fly in size 1 or 2 to ensure perfect presentation and minimize line twist.
The Early Season Specialist – J:son Mayfly Dun 3 Mahogny (Hook #18) The Mahogny Dun in size #18 is the definitive match for one of the season's most important hatches: the Mahogny Mayfly (Leptophlebia vespertina). Known as one of the first major hatches of the year, these dark-bodied duns often appear on cold, windy spring days when little else is moving, but they remain a vital food source in forest lakes and slow streams well into the summer.
Tied on a precise size #18 hook, this imitation captures the deep, dark brown coloration and slender profile of the Leptophlebia perfectly. Its realistic foam body and air-trapping wings ensure the fly sits high in the surface film, mimicking a newly hatched dun struggling to take flight. In the clear, still waters of a spring forest tarn or the steady glides of a river, the Mahogny #18 provides the exact silhouette needed to fool "rising-shy" trout and grayling that are focused on these early-season dark duns.