Description
Stoneflies: The All-Season Fly for Serious Anglers
Found in clean, moving waters all over the world, the stonefly is a cornerstone of a trout's diet. No matter where you're casting a line—from the freestone rivers of the American West to the pristine streams of Scandinavia or New Zealand—these insects are a constant and reliable food source.
Often called the "year-round fly," stoneflies are active throughout all four seasons. This makes them a critical food source for fish, especially when other hatches are scarce. Their presence is a sign of a healthy, clean ecosystem, and their importance to an angler cannot be overstated. Because they provide a high-calorie meal that fish of all sizes actively seek out, a realistic stonefly imitation is one of the most effective and versatile tools in your fly box.
J:son Stonefly Adult 5 Yellow (#20)
The Ultra-Micro Summer Finesse – Small Yellow Sally Specialist The J:son Stonefly Adult 5 Yellow in size #20 is the smallest and most technical 13 mm yellow dry fly in the range. This ultra-micro profile is specifically designed to match the smallest species of Yellow Sallies and other tiny, pale stoneflies that hatch during the bright summer months. When trout become highly selective in low, clear water and focus on miniature yellow insects, this precision-crafted fly is often the only way to get a rise.
Why this fly delivers:
-
Ultimate Small-Scale Match: At 13 mm, this fly replicates the tiniest yellow stonefly species that other patterns fail to imitate. It is the perfect choice for high-pressure situations where fish "sip" small insects with extreme caution.
-
Unsinkable Foam Technology: Despite its microscopic size, it utilizes J:son’s proprietary foam-body technology. It rides high and proud on the water, staying buoyant through long drifts and resisting the "drowning" effect that often plagues traditional small flies.
-
High-Visibility Finesse: The vibrant yellow color makes this micro-fly surprisingly easy to track for the angler, even in broken water or glinting sunlight, while acting as a powerful visual trigger for the fish.
-
Realistic Surface Signature: The scaled-down, air-trapping wings and delicate legs create an authentic light-refraction pattern. This realistic footprint is essential for fooling trophy trout and grayling in crystal-clear mountain streams.
Pro Tip: This is a "must-have" for mid-summer sessions on technical rivers. Use a very long, fine 6X or 7X tippet to ensure the most natural drift possible. Because it is so light and realistic, it works exceptionally well in flat water and slow glides where fish have plenty of time to inspect their prey before committing.