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 (#16)
The Micro Yellow Sally – Chloroperla and Isoperla Specialist The J:son Tungsten Stonefly Nymph 5 Yellow in size #16 is a precision-crafted 12 mm imitation, featuring an integrated tungsten core. This "Micro" nymph is specifically designed to replicate the smallest yellow-toned stonefly species, such as the Small Yellow Sally (Chloroperla torrentium) and the early nymphal stages of the Yellow Sally (Isoperla grammatica).
Why this fly works:
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Small Profile, Deep Reach: In summer, when water levels are low but currents remain swift in oxygenated riffles, you need a fly that is small enough to be realistic but heavy enough to reach the bottom. The tungsten weight in this 12 mm body provides that perfect balance.
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Biological Accuracy: In many rivers, the smaller Chloroperla species are far more numerous than their larger cousins. The 12 mm profile and translucent yellow coloration perfectly match these "summer stones" that trout and grayling target with confidence.
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The "Attractor" Effect: The vibrant yellow palette acts as a natural attractor. In clear water or bright sunlight, this fly reflects light in a way that mimics the organic glow of a real nymph, making it easy for fish to spot among the dark rocks.
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Anatomical Mastery: Despite its tiny size, this S5 model retains J:son’s industry-leading realism. It features meticulously detailed segmented wing pads and fine, flexible legs that provide subtle, lifelike micro-movements in the current.
Pro Tip: This is a "must-have" for technical summer fishing. When the water is low and clear, fish this #16 Yellow Tungsten nymph through well-oxygenated riffles and pocket water. It is a legendary producer for large grayling and is often the only thing that will fool selective trout during a bright summer afternoon when they are tucked deep in the bubbles.