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 Pale Summer Specialist – J:son Mayfly Dun 3 Vanilla Cream (Hook #18) When the summer heat brings out the lightest-colored mayflies, such as the Heptageniidae family or small Pale Morning Duns, the Vanilla Cream Dun becomes an essential tool in your fly box. These pale insects often hatch in the bright light of midday or during the warm summer evenings, demanding an imitation with exactly the right translucency and tone.
Tied on a subtle size #18 hook, this fly features a delicate cream-colored foam body and realistic wings that perfectly mimic the ghost-like appearance of the natural insect. Its ability to stay high in the surface film makes it a prime target for trout looking for an easy, visible meal. When the fish are ignoring darker patterns and focusing exclusively on the lightest duns in the drift, the Vanilla Cream #18 provides the technical edge needed for success in crystal-clear summer waters.