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: Because they are poor swimmers, they often tumble along the bottom or drift downstream when searching for new habitats, making them an easy meal.
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The Crawlers: Unlike mayflies, stoneflies don't swim to the surface to hatch—they crawl to the shore. This means they spend their entire life cycle close to the riverbed.
J:son Stonefly Nymph 5 Yellow (#16)
The Micro Yellow Sally – Chloroperla and Isoperla Specialist The J:son Stonefly Nymph 5 Yellow in size #16 is a delicate and ultra-realistic 12 mm imitation. This "Micro" model 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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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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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.
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The "Hot Spot" Effect: The vibrant yellow/gold 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, triggering aggressive strikes from selective fish.
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Soft-Body Technology: Constructed from J:son’s signature flexible materials, the nymph offers a natural "give." This life-like texture ensures that fish hold onto the fly longer, allowing for a more effective hook set on delicate takes.
Pro Tip: This is a "must-have" for technical summer fishing. When the water is low and clear, fish this #16 Yellow 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 summer afternoon.