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 Summer Evening Ghost – J:son Mayfly Dun 4 Black (Hook #22) The Black Dun in size #22 is a specialist fly designed to master the most challenging fishing scenarios – the massive hatches of small, dark mayflies like the Caenis (Angler's Curse). These tiny insects often hatch in late summer evenings, covering the water’s surface in a black carpet that drives trout and grayling into a feeding frenzy, while making them incredibly selective.
Tied on an ultra-fine size #22 hook, this imitation is among the smallest in the J:son range. Despite its size, the realistic black foam body and precise wing profile create a silhouette that stands out just enough for the fish to pick it out from the thousands of natural insects. It floats remarkably well and sits low in the film, exactly like a newly emerged Caenis dun. When the water is flat and the fish are rising to "invisible" black specks, the Black #22 is the key to unlocking the puzzle and turning frustration into success.