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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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Stonefly Genus Hydroperla

Where & when

In 20 records from GBIF, adults of this genus have mostly been collected during April (60%), March (20%), and May (10%).

In 2 records from GBIF, this genus has been collected at elevations of 485 and 3806 ft.

Genus Range

Start a Discussion of Hydroperla

Stonefly Genus Hydroperla

Taxonomy
Species in Hydroperla: Hydroperla fugitans
3 species (Hydroperla crosbyi, Hydroperla phormidia, and Hydroperla rickeri) aren't included.
Genus Range
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