Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

The Middle Fork of the Koyukuk River in Alaska

Stream photos

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Zapada cinctipes (Tiny Winter Black) Stonefly Nymph Zapada cinctipes (Tiny Winter Black) Stonefly Nymph

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.

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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.

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Isoperla marmorata and Taenionema pacificum

Millcreek has attached these 4 pictures to aid in identification. The message is below.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Feb 21, 2018February 21st, 2018, 6:50 am EST

I've had the Isoperla species in here before but it was dead when photographed and these are live. Species were identified to genus using "An Introduction to the Aquatic Insects of North America" by Merritt, Cummins and Berg (2008). They were identified to species using "The Isoperla of California (Plecoptera: Perlodidae) Larval Descriptions and a Key to 17 Western Nearctic Species" by J.B. Sandberg.(2011).
http://www2.pms-lj.si/illiesia/papers/Illiesia07-22.pdf
And "New Descriptions of North American Taenionema Larvae (Plecoptera; Taeniopterygidae)" by K.W. Stewart (2009).http://www.zobodat.at/pdf/Illiesia_05_0128-0145.pdf

The nymphs were collected 2/20/18 in shallow, fast water with small to medium gravel. The Isoperla marmorata was 13-15 mm and the Taenionema pacificum was 9-12 mm.

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