Isonychia are large mayflies, often called Slate Drakes. Their hatches can be exceptional and long lasting and the nymphs are very strong swimmers. As larger mayflies, trout key in on them very quickly under the old calories gained for calories burned equation. This fly is an excellent pattern to swim in riffle water where Slate Drake flies (Isonychias) are known to hatch. Color, Natural.
Fly available in sizes: 10, 12.
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