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.

Two major forks of this grayling stream come together in this pretty pool.

From the Chena River in Alaska

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 Micrasema rusticum (Little Grannoms)

Where & when

Time of year : June and July

In 48 records from GBIF, adults of this species have mostly been collected during May (40%), June (35%), April (8%), August (8%), and July (6%).

In 5 records from GBIF, this species has been collected at elevations ranging from 659 to 2152 ft, with an average (median) of 1112 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Evening

Start a Discussion of Micrasema rusticum

References

Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.