Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Sunlight perfectly strikes the trees at a bend in the Foss River in the Washington Cascades.

From the Foss River in Washington

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)

Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.

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.

Hesperoperla pacifica (Golden Stone) Stonefly Nymph Pictures

ID notes from the microscope: The occiput has a sinuate, irregularly spaced spinule row.

Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho

Dorsal view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho

Ruler view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho The smallest ruler marks are 1 mm.

The nymph was out of the water in this picture, because it wouldn't stop wriggling and flip over.

Ventral view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho

I had to wait until after this one died in the preservative (alcohol) before I could get a wetted ventral view, because it was too squirmy otherwise.

Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho

This stonefly was collected from the East Fork Big Lost River in Idaho on August 3rd, 2020 and added to Troutnut.com by Troutnut on August 19th, 2020.

Start a Discussion of Nymph