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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Two major forks of this grayling stream come together in this pretty pool. From the Chena River in Alaska

Stream photos

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Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington
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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Epeorus grandis Mayfly Nymph Pictures

Ventral view of a Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Dorsal view of a Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Ruler view of a Epeorus grandis (Heptageniidae) Mayfly Nymph from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.

This mayfly was collected from the South Fork Snoqualmie River in Washington on March 19th, 2019 and added to Troutnut.com by Troutnut on June 14th, 2019.


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Epeorus grandis Mayfly Nymph Pictures

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Ephemeroptera (Mayflies)
  5. » Family Heptageniidae (March Browns, Cahills, Quill Gordons)
  6. » Genus Epeorus (Little Maryatts)
  7. » Species grandis
Collection details
Location: South Fork Snoqualmie River, Washington
Date: March 19th, 2019
Added to site: June 14th, 2019
Author: Troutnut
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