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.

Middle Fork Snoqualmie

From the Middle Fork Snoqualmie River in Washington

Stream photos

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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

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.

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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 verrula (Green Sedges)

Where & when

Time of year : Fall

In 29 records from GBIF, adults of this species have mostly been collected during August (41%), September (34%), and October (17%).

In 29 records from GBIF, this species has been collected at elevations ranging from 131 to 10984 ft, with an average (median) of 8665 ft.

Species Range

source

Map of specific collection sites

Larva & pupa biology

Diet: Algae, aquatic plant leaves, moss

Environmental tolerance: Best in cold, spring-fed streams

Start a Discussion of Rhyacophila verrula

References

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