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 2 Cinnamon Brown (#12)
The Versatile All-Rounder – Siphlonurus & Heptagenia Specialist The J:son Mayfly Dun 2 Cinnamon Brown in size #12 is a highly versatile imitation measuring 20 mm. This model is widely considered the "all-round" choice in the J:son range for mimicking a vast array of medium-sized, brownish mayfly species. It is specifically designed to match the silhouette and warm tones of insects like the Siphlonurus (Large Summer Mayflies) and various Heptagenia species commonly found in rivers and lakes.
Why this fly delivers:
-
Anatomical Precision: Model 2 is perfectly proportioned to represent a calorie-rich meal. Its cinnamon-brown hue accurately replicates the natural darkening of the insect's body as it transitions into its adult stage.
-
The "Unsinkable" Foam Body: Like all J:son dry flies, it features a detached foam body that provides exceptional buoyancy. Even in broken water or after several catches, this fly stays high in the surface film without the constant need for floatant.
-
Realistic Wing Footprint: The wings are made from a specialized material that traps air and reflects light naturally. On the water, they leave a distinct, sail-like imprint that selective trout recognize as a real, vulnerable insect.
-
Durability: Unlike traditional feather-and-hackle flies, the J:son system uses materials that can withstand numerous takes from aggressive fish without losing their shape or effectiveness.
Pro Tip: Because this is a Model 2 fly with realistic wings, it can act like a small propeller during casting. To prevent severe line twist on your leader and ensure a natural presentation, we strongly recommend using a J:son Anti-Twist Swivel.