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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 Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington
Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.
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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Hesperoperla pacifica (Golden Stone) Stonefly Nymph Pictures

Ruler view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.
Dorsal view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Ventral view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the South Fork Snoqualmie River in Washington

This stonefly was collected from the South Fork Snoqualmie River in Washington on March 19th, 2019 and added to Troutnut.com by Troutnut on June 14th, 2019.

Discussions of this Nymph

Hesperoperla pacifica
Posted by Millcreek on Jul 19, 2019
Last reply on Jul 19, 2019 by Millcreek
Most likely Hesperoperla pacifica. Examples can be seen here.
https://bugguide.net/node/view/196000/bgimage

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References

Hesperoperla pacifica (Golden Stone) Stonefly Nymph Pictures

Collection details
Location: South Fork Snoqualmie River, Washington
Date: March 19th, 2019
Added to site: June 14th, 2019
Author: Troutnut
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