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 4 Olive Brown (#12)
The Chloroperla and Amphinemura Imitator The J:son Stonefly Nymph 4 Olive Brown in size #12 features a compact 16 mm profile. This specific color and size are engineered to mimic the smaller, earthy-toned nymphs of the Chloroperlidae (Small Yellow Sallies) and Nemouridae families, such as Amphinemura sulcicollis. These species are incredibly common in stony-bottomed streams and are a primary food source during the late spring and summer.
Why this fly works:
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Biological Accuracy: The Olive Brown palette provides a subtle, natural camouflage that perfectly replicates the "mossy" appearance of small Amphinemura nymphs. At 16 mm, it represents a mature nymph of these smaller species or a juvenile stage of the larger Perlodes.
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Anatomical Mastery: Features J:son’s industry-leading realism, including a meticulously detailed thorax and fine, flexible legs. The anatomical accuracy is essential for this smaller size, as it is often used in clear water where fish have more time to inspect the fly.
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Versatile Stealth: The #12 hook combined with a 16 mm body offers a non-threatening silhouette. It is the perfect "middle-ground" nymph—substantial enough to attract attention but small enough to fool wary fish in high-pressure waters.
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Soft-Body Technology: Built from J:son’s signature flexible materials, the nymph feels "organic" to the fish. This life-like texture ensures that trout and grayling don't immediately reject the fly, significantly increasing your hook-up rate.
Pro Tip: This is a fantastic "utility" nymph. It excels in clear, shallow runs and riffles where larger nymphs might be too aggressive. Fish it on a light leader with a dead-drift technique to mimic a nymph that has naturally lost its footing on a rock.