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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.

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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Mayfly Species Heptagenia adaequata

There is no report of this rare species being important to anglers.
Species Range

Specimens of the Mayfly Species Heptagenia adaequata

1 Male Spinner

Start a Discussion of Heptagenia adaequata

Mayfly Species Heptagenia adaequata

Species Range
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