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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.

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
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
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
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.


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Hesperoperla pacifica (Golden Stone) Stonefly Nymph Pictures

Collection details
Location: East Fork Big Lost River, Idaho
Date: August 3rd, 2020
Added to site: August 19th, 2020
Author: Troutnut
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