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 Ghost of the Summer Night – J:son Mayfly Dun 5 Vanilla Cream (Hook #24) When the sun barely dips below the horizon and the water is covered in thousands of tiny, cream-colored insects, the Vanilla Cream #24 is your go-to pattern. This micro-imitation is designed to match the smallest light-colored mayflies, such as the tiny Caenis species or the smallest Pale Summer Duns. In these conditions, fish often become so selective that even a size #22 is ignored in favor of these near-microscopic targets.
Tied on an incredibly small size #24 hook, this fly is a masterpiece of technical design. J:son’s unique foam construction provides the buoyancy needed to keep such a tiny fly floating perfectly in the surface film, while the pale vanilla hue offers a subtle but clear silhouette against the water. This is a "stealth" fly for the most demanding situations – ideal for calm lake surfaces and slow river pools where the trout have time to scrutinize every detail. If you see fish "sipping" tiny white or cream dots, this is the only answer.