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.

A small spring creek in Wisconsin. A little brook trout stream tumbles over boulders

Stream photos

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Limnephilidae (Giant Sedges) Caddisfly Larva Limnephilidae (Giant Sedges) Caddisfly Larva

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington

This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.

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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 glaberrima (Green Sedges)

Where & when

Time of year : Late spring through summer; peaks in late summer

This species is most common in the East.

In 51 records from GBIF, adults of this species have mostly been collected during June (22%), August (20%), July (20%), September (18%), May (8%), and October (6%).

In 32 records from GBIF, this species has been collected at elevations ranging from 650 to 5764 ft, with an average (median) of 2522 ft.

Species Range

source

Map of specific collection sites

Start a Discussion of Rhyacophila glaberrima

References

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