Header image
Enter a name
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 Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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.

Male Baetis bicaudatus (BWO) Mayfly Nymph Pictures

This specimen was collected along with a female which was quite a bit larger, different in color, but otherwise seemed the same morphologically.

Lateral view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Dorsal view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Ventral view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Ventral view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Ruler view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington The smallest ruler marks are 1 mm.
The darkened hind wing pad is clearly visible in this one.

Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington

This mayfly was collected from Holder Creek in Washington on April 12th, 2021 and added to Troutnut.com by Troutnut on April 13th, 2021.


Start a Discussion of Nymph

Male Baetis bicaudatus (BWO) Mayfly Nymph Pictures

Collection details
Location: Holder Creek, Washington
Date: April 12th, 2021
Added to site: April 13th, 2021
Author: Troutnut
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy