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.

The Tanana River in Alaska

Stream photos

Featured on the forum
Re: Trico emergers
In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)
Re: Trico Tips
In the Mayfly Genus Tricorythodes by Martinlf
Re: UV spectrum and trout
In General Discussion by Martinlf
Re: closing the gender gap in flyfishing
In General Discussion by Konchu (Smallflyguy replied)
Re: Fishing Kupa River, Slovenia
In Fishing Reports by Slocum (Fish1 replied)
Onocosmoecus (Great Late-Summer Sedge) Caddisfly LarvaOnocosmoecus (Great Late-Summer Sedge) Caddisfly Larva
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.
9 Recently Added Photos
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.

  1. Trout Streams
    2. ›
  2. Idaho
    3. ›
  3. The Henry's Fork of the Snake River

  1. Trout Streams
    2. ›
  2. Idaho
    3. ›
  3. The Henry's Fork of the Snake River

Landscape & scenery photos from the Henry's Fork of the Snake River

The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
Mesa Falls From the Henry's Fork of the Snake River in Idaho
Harriman Ranch on the Henry's Fork From the Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
Lower end of the storried Harriman Ranch section of the Henry's From the Henry's Fork of the Snake River in Idaho
Upper Mesa Falls on the Henry's Fork of the Snake River From the Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho

Closeup insects by Troutnut from the Henry's Fork of the Snake River in Idaho

4
Male Ephemerella excrucians (Pale Morning Dun) Mayfly Spinner
Lateral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
7
Male Ephemerella excrucians (Pale Morning Dun) Mayfly Dun
Lateral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Henry's Fork of the Snake River in Idaho
5
Male Ephemerella excrucians (Pale Morning Dun) Mayfly Spinner
Lateral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
7
Female Ephemerella excrucians (Pale Morning Dun) Mayfly Spinner
Lateral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from Red Rock Creek in Idaho
8
Male Acerpenna pygmaea (Tiny Blue-Winged Olive) Mayfly Spinner
Lateral view of a Male Acerpenna pygmaea (Baetidae) (Tiny Blue-Winged Olive) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
17
Leptoceridae Caddisfly Adult
Lateral view of a Leptoceridae Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
This specimen keyed easily to Leptoceridae, but I hit a bit of a dead end in the genus key, because I can't seem to find the cross-veins in the wings that are supposed to help narrow it down. I took pictures of all the relevant features under the microscope; maybe somebody with more experience with the family can help.
9
Female Siphlonurus occidentalis (Gray Drake) Mayfly Spinner
Lateral view of a Female Siphlonurus occidentalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
8
Male Hydropsyche (Spotted Sedge) Caddisfly Adult
Lateral view of a Male Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
6
Male Ephemerella excrucians (Pale Morning Dun) Mayfly Spinner
Lateral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
7
Female Drunella grandis (Western Green Drake) Mayfly Dun
Lateral view of a Female Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Dun from the Henry's Fork of the Snake River in Idaho
I didn't find a male spinner to associate with this one; I'm tentatively calling it grandis based on size alone. I found it floating down the surface of the Henry's Fork (the only one I saw that day, weeks after the hatch probably peaked) crippled by what appears to be a mass of eggs sticking out of its abdomen.
5
Female Callibaetis ferrugineus (Speckled Dun) Mayfly Spinner
Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
8
Male Epeorus albertae (Pink Lady) Mayfly Spinner
Lateral view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy