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, old rock wing dam has created an excellent riffle and pool in this classic trout stream.

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 basalis (Green Sedges)

Where & when

Time of year : Mid-summer

Altitude: Mostly high

In 2 records from GBIF, adults of this species have been collected during May (50%) and January (50%).

In 1 record from GBIF, this species has been collected at elevation of 3402 ft.

Species Range

source

Map of specific collection sites

Start a Discussion of Rhyacophila basalis

References

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