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.

Stream photos

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Male Baetidae (Blue-Winged Olive) Mayfly Dun Male Baetidae (Blue-Winged Olive) Mayfly Dun

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington

This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.

7 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.

Autumn Springflies

This common name refers to only one species. Click its scientific name to learn more.

Stonefly Species Pictetiella expansa

These are very rarely called Autumn Springflies.

Female Pictetiella expansa (Autumn Springfly) Stonefly Adult

12 Pictures

Lateral view of a Female Pictetiella expansa (Perlodidae) (Autumn Springfly) Stonefly Adult from the South Fork Snoqualmie River in Washington

Based on photos, this specimen seems to key out (using Merritt & Cummins 4th Edition) to Pictetiella expansa, but some of the characteristics aren't 100 % clear. Frisonia picticeps is another possibility. The range map doesn't show Pictetiella expansa in Washington, but that species is listed elsewhere as occurring near Puget Sound, and the head markings are similar to (albeit not a perfect match for) those of a male from Colorado in the scientific literature.

Collected June 15, 2018 from the South Fork Snoqualmie River in Washington

Added by Troutnut on July 3, 2018

Collected June 15, 2018 from the South Fork Snoqualmie River in Washington and added by Troutnut on July 3, 2018