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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.

Dorsal view of a Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.
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.
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Isoperla fusca (Yellow Sally) Stonefly Nymph Pictures

This specimen keys to Isoperla fusca using the key in Szczytko & Stewart 1979, but some species of Isoperla weren't represented there. It's probably the same species as this one collected a year later. Despite taking many good pictures of both, I'm not sure of the species ID.

Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Dorsal view of a Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Ruler view of a Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington The smallest ruler marks are 1 mm.
Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
The row of stout setae along the back of the head (anterior of the occiput) on this specimen was relevant to the species ID.

Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Nymph from the Yakima River in Washington

This stonefly was collected from the Yakima River in Washington on April 9th, 2021 and added to Troutnut.com by Troutnut on April 12th, 2021.


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Isoperla fusca (Yellow Sally) Stonefly Nymph Pictures

Collection details
Location: Yakima River, Washington
Date: April 9th, 2021
Added to site: April 12th, 2021
Author: Troutnut
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