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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.

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Stenonema (March Browns and Cahills) Mayfly Nymph Pictures

Dorsal view of a Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from the Namekagon River in Wisconsin
Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from the Namekagon River in Wisconsin
Ventral view of a Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from the Namekagon River in Wisconsin
Ruler view of a Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from the Namekagon River in Wisconsin The smallest ruler marks are 1 mm.

This mayfly was collected from the Namekagon River in Wisconsin on June 8th, 2021 and added to Troutnut.com by Troutnut on June 9th, 2021.


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Stenonema (March Browns and Cahills) Mayfly Nymph Pictures

Collection details
Location: Namekagon River, Wisconsin
Date: June 8th, 2021
Added to site: June 9th, 2021
Author: Troutnut
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