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Isonychia (Slate Drakes) Mayfly Nymph Pictures

 This smaller Isonychia nymph was caught with a bunch of bicolor specimens, but it does not have the fluffy spine structure at the base of its gills. This might mean it's Isonychia sayi, or it might just be a bicolor nymph too young to have developed those structures.

This mayfly was collected from the Namekagon River on January 13th, 2004 and added to Troutnut.com on January 25th, 2006.

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Isonychia (Slate Drakes) Mayfly Nymph from the Namekagon River in Wisconsin
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Isonychia (Slate Drakes) Mayfly Nymph from the Namekagon River in Wisconsin
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Isonychia (Slate Drakes) Mayfly Nymph from the Namekagon River in Wisconsin

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