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Isonychia NymphNymphintermediate

Great Lakes

Isonychia Nymph

Flybox sourcing profile

No TWG price or checkout is active. Use this page to validate the fly, then source it through the mapped tier or trusted fly shops.

Available Sizes#10 - #14
Color Variations
Dark MahoganyBrown/White LegsMaroon

Pattern Ledger

Source Isonychia Nymph

Want help finding this exact pattern or a tied-to-order equivalent? Join the sourcing ledger and we will prioritize demand by water, species, and pattern.

Sourcing Ledger

Where to source this pattern

TWG checkout is closed. These are current sourcing leads, scored by mapped tier, region, species, fly type, and named-pattern evidence. Confirm availability directly with the tier or shop.

Regional shopStrong match

Schultz Outfitters

Matched on Great Lakes, nymph flies, trout. Michigan and Great Lakes shop lead for steelhead, trout, and smallmouth patterns.

Great Lakesnymph fliestrout
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Broad sourceStrong match

Fly Fish Food

Matched on nymph flies, trout, mayfly. Strong technical tying and trout catalog coverage, especially nymphs, dries, and stillwater flies.

nymph fliestroutmayfly
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Broad sourceStrong match

Fulling Mill Flies

Matched on nymph flies, trout, nymph. Large pattern house with broad freshwater and saltwater fly categories.

nymph fliestroutnymph
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Broad sourceStrong match

Big Y Fly Co.

Matched on nymph flies, trout, nymph. Broad by-type catalog useful for common benchmark patterns and inexpensive backups.

nymph fliestroutnymph
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Regional shopStrong match

Dette Flies

Matched on nymph flies, trout, mayfly. Catskill lineage fly shop with deep dry-fly, wet-fly, and Northeast trout relevance.

nymph fliestroutmayfly
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Isonychia nymphs are the marathon runners of the mayfly world -- fast, sleek, and perpetually in motion. They swim through the current column like tiny competitive athletes, and trout intercept them with the precision of a pickpocket on a crowded subway. This imitation captures the dark body and pale legs that trout look for, because even predators have standards when the buffet is this specific.

Quick Facts

TypeNymph
Difficultyintermediate
SeasonsSummer, Fall
Target SpeciesBrown Trout, Rainbow Trout
Sizes#10 - #14
Best LocationsAu Sable River, MI; Pere Marquette River, MI; Manistee River, MI

Where to Fish It

Au Sable River

MI · Freestone River

Pere Marquette River

MI · Freestone River

Manistee River

MI · Freestone River

Map unavailable. Locations for Isonychia Nymph: Au Sable River, MI; Pere Marquette River, MI; Manistee River, MI

Related Reading

hatch guide

The Hex Hatch: After Dark on the Great Lakes

The Hex hatch is the defining event of Great Lakes fly fishing — a massive emergence of North America's largest mayfly that happens after dark and brings the biggest brown trout of the year to the surface. This is how to prepare for, find, and fish the most anticipated hatch in the Midwest.

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