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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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 narvae (Green Sedges)

Where & when

Time of year : Early summer

Preferred waters: Small mountain streams

In 17 records from GBIF, adults of this species have been collected during June (29%), July (29%), August (12%), May (12%), April (12%), and March (6%).

In 2 records from GBIF, this species has been collected at elevations of 197 and 6726 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Morning

Egg-Laying behavior

Time of day: Morning

Start a Discussion of Rhyacophila narvae

References

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