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:
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Correct Surface Print: The imitation creates the precise silhouette on the water film that triggers the selective fish.
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Optimal Vulnerability: Designed to mimic the wing-drying, vulnerable Mayfly just before take-off.
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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 Late Season Brown – J:son Mayfly Dun 3 Cinnamon Brown (Hook #18) The Cinnamon Brown Dun in size #18 is a specialized pattern designed to match the darker, brownish mayflies that often emerge in the transition from summer to autumn. This warm, reddish-brown hue is particularly effective for imitating species like the Leptophlebia or small brown duns found in woodland streams and peat-stained waters.
Tied on a sturdy size #18 hook, this imitation captures the exact color profile and delicate silhouette that selective trout and grayling look for when dark-winged insects are on the water. The realistic foam body and air-filled wings provide exceptional buoyancy and leave a natural footprint in the surface film. Whether you're fishing a quiet forest pool or a slow-moving river during a cool September evening, the Cinnamon Brown #18 is the go-to choice for matching nature’s darker hatches with absolute precision.