Description
The Mayfly Dun: The Moment of Truth
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. When the hatching is frequent, many fish species become selective and only feed on Duns. To succeed, your fly needs the right shape, size, proportions, colors, and, not least, the correct footprint on the water.
J:son Mayfly Dun 1 Cinnamon Brown (#10)
The Giant Mayfly Specialist – Ephemera Danica & Vulgata Expert The J:son Mayfly Dun 1 Cinnamon Brown is a masterpiece of realism, measuring a substantial 28 mm. This fly is specifically designed to imitate the largest mayfly species, such as the famous Green Drake or the European Åsandslända (Ephemera danica). Its cinnamon-brown hue provides a natural, warm tone that perfectly mimics the darkening bodies and wings of large duns as they sit vulnerable on the surface.
Why this fly delivers:
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Correct Surface Print: The extended foam body and large, upright wings create the exact "sail" silhouette and footprint that trophy trout look for. This specific imprint is the key to fooling selective fish during a heavy hatch.
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Optimal Vulnerability: This imitation is designed to sit in the surface film just like a natural dun struggling to dry its wings. This "vulnerable" posture makes it an irresistible meal for large trout and grayling.
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Unsinkable Foam Body: Built with J:son’s specialized foam technology, this 28 mm fly offers incredible buoyancy. It rides high and stable, ensuring it stays visible and effective even in choppy water or during long drifts.
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Anatomical Accuracy: From the delicate tails to the pre-formed wings, every proportion is modeled after the real insect. It doesn’t just look like a fly; it looks like life.
Pro Tip: For a fly of this size and wing surface, we highly recommend using a J:son Swivel. Because of the large wings, the fly can act like a propeller during casting; a swivel is necessary to ensure a perfect presentation and to eliminate line twist.