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.

Stream photos

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Tricorythodes (Trico) Mayfly Nymph Tricorythodes (Trico) Mayfly Nymph

Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Mystery Creek #308 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.

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Caddisfly Species Rhyacophila lobifera (Green Sedges)

Where & when

Time of year : May and June

This species is reportedly most common in Pennsylvania and New York.

In 29 records from GBIF, adults of this species have mostly been collected during April (45%), May (31%), March (10%), and June (7%).

In 25 records from GBIF, this species has been collected at elevations ranging from 374 to 4183 ft, with an average (median) of 2805 ft.

Species Range

source

Map of specific collection sites

Egg-Laying behavior

Gary LaFontaine reports in Caddisflies that adults of this species may gather in tight balls and float along on the surface. I have observed this peculiar behavior in other caddisfly species, and I assume it has something to do with mating.

Start a Discussion of Rhyacophila lobifera

References

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