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.

Stream photos

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington

This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.

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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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Caddisfly Species Rhyacophila vaccua (Green Sedges)

Where & when

Time of year : Late summer and fall

This is a common species in the Pacific Northwest.

In 21 records from GBIF, adults of this species have been collected during September (43%), August (33%), July (14%), and October (10%).

In 5 records from GBIF, this species has been collected at elevations ranging from 131 to 5873 ft, with an average (median) of 2920 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Afternoon

Egg-Laying behavior

Time of day: Afternoon

Start a Discussion of Rhyacophila vaccua

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.