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

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

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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 Genus Hydatophylax (Giant Cream Pattern-Wing Sedges)

These are huge caddisflies. The larvae may be nearly an inch and a half long and build three-inch cases. Hook sizes 4-6 are appropriate for the pupae.

Where & when

Time of year : Late May to fall in the East; August to October in the West

Preferred waters: Medium to large streams

In 69 records from GBIF, adults of this genus have mostly been collected during June (46%), July (22%), May (19%), and August (7%).

In 14 records from GBIF, this genus has been collected at elevations ranging from 33 to 2740 ft, with an average (median) of 2008 ft.

Genus Range

Hatching behavior

Time of day : Morning

Trout may feed on the pupae of this genus.

Egg-Laying behavior

The egg-laying adults are not important.

Larva & pupa biology

Diet: Woody debris

Current speed: Slow

Specimens of the Caddisfly Genus Hydatophylax

1 Female Adult

Start a Discussion of Hydatophylax


Caddisfly Genus Hydatophylax (Giant Cream Pattern-Wing Sedges)

Species in Hydatophylax: Hydatophylax argus, Hydatophylax hesperus
2 species (Hydatophylax variabilis and Hydatophylax victor) aren't included.
Genus Range
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