Description
Stonefly Nymphs – The Year-Round Secret
Why Stonefly Nymphs are a must-have:
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Protein Power: These nutrient-rich nymphs are a primary food source for trout and grayling all year long.
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Easy Targets: As poor swimmers, they often lose their grip and drift downstream, becoming an effortless "snack" for waiting fish.
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Bottom Dwellers: Unlike many insects, they don't swim to the surface to hatch; they crawl to the shore. This keeps them in the "strike zone" near the riverbed for their entire life cycle.
J:son Tungsten Stonefly Nymph 5 Yellow – Barbless (#16)
The Micro Yellow Sally – Isoperla Specialist The J:son Tungsten Stonefly Nymph 5 Yellow Barbless in size #16 is a bright, high-performance 13 mm imitation. Featuring an integrated tungsten core and a premium barbless hook, this is the smallest "Yellow Sally" nymph in the range. It is designed to get a tiny, high-visibility profile down to the riverbed where fish are selectively feeding on small, pale stoneflies.
Why this fly works:
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Tiny Anchor: Finding a fly this small (13 mm) that can reach the bottom in a fast current is a game-changer. The tungsten weight allows you to maintain a delicate profile while still reaching the "strike zone" instantly without the need for additional weight on your leader.
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The "Yellow Sally" Match: Size #16 is the perfect anatomical match for the juvenile stages of Yellow Sallies and other small Isoperla species. The vibrant yellow/gold color acts as a natural attractor, making it stand out in dark riverbeds or shaded mountain streams.
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Catch & Release Ready: The barbless hook is specifically chosen for technical fishing. It provides excellent penetration on light tippets and ensures a quick, damage-free release of the wild trout and grayling that target these small insects.
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Organic Micro-Movement: Despite its miniature scale, J:son’s signature flexible legs and segmented body are engineered to move. These parts vibrate naturally in the current, providing the lifelike visual cues that trigger a strike from selective fish.
Pro Tip: This is an elite choice for "Euro Nymphing" in low-water conditions or late summer. Because it is bright and heavy for its size, it works exceptionally well as a "sight fly" that you can track through the drift. It is also a deadly dropper fly to hang 30–50 cm behind a large dry fly when fish are rising to small, pale insects in the riffles.