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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.

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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 Nemoura (Tiny Winter Blacks)

Where & when

In 41 records from GBIF, adults of this genus have mostly been collected during May (27%), June (27%), July (24%), September (10%), and August (7%).

In 16 records from GBIF, this genus has been collected at elevations ranging from 20 to 6562 ft, with an average (median) of 830 ft.

Genus Range

Start a Discussion of Nemoura

Stonefly Genus Nemoura (Tiny Winter Blacks)

Taxonomy
2 species (Nemoura rickeri and Nemoura spiniloba) aren't included.
Genus Range
Common Name
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