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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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

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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.

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.

Caddisfly Species Rhyacophila coloradensis (Green Sedges)

Where & when

Time of year : August and September

Preferred waters: Large rivers

This species is important in the Northern inland Rocky Mountain states. It is reported to be the most abundant species of the genus in Wyoming.

In 76 records from GBIF, adults of this species have mostly been collected during July (25%), June (22%), August (18%), April (11%), September (8%), and May (7%).

In 54 records from GBIF, this species has been collected at elevations ranging from 394 to 10587 ft, with an average (median) of 6959 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Afternoon

Egg-Laying behavior

Time of day: Afternoon

Larva & pupa biology

Current speed: Fast

Substrate: Rocky

Start a Discussion of Rhyacophila coloradensis

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.