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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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington

This species was fairly abundant in a February sample of the upper Yakima.

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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.

Female Callibaetis ferrugineus (Speckled Dun) Mayfly Dun Pictures

This is one of four specimens I photographed together from the same hatch, also including a nymph, a male dun, and a male spinner.

Ruler view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Dun from Mystery Creek #304 in Idaho The smallest ruler marks are 1 mm.

Dorsal view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Dun from Mystery Creek #304 in Idaho

Ventral view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Dun from Mystery Creek #304 in Idaho

This mayfly was collected from Mystery Creek #304 in Idaho on July 23rd, 2022 and added to Troutnut.com by Troutnut on January 15th, 2023.

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