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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.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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.

Updates from January 18, 2004

Updates from January 18, 2004


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Videos by Troutnut from in

Isonychia nymph swimming around

These nymphs may be the best swimmers of all North American mayflies.

Closeup insects by Troutnut from Miscellaneous Wisconsin and the Namekagon River in Wisconsin

Stenonema luteum (Heptageniidae) Mayfly Nymph from unknown in Wisconsin
Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Nymph from unknown in Wisconsin
Isonychia bicolor (Isonychiidae) (Mahogany Dun) Mayfly Nymph from the Namekagon River in Wisconsin

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