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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 Species Paragnetina media (Embossed Stoneflies)

This is one of the major species of the Perlidae family, perhaps the most important in the East.

Where & when

Time of year : Late June through late July

In 67 records from GBIF, adults of this species have mostly been collected during June (33%), July (24%), May (21%), August (9%), and April (6%).

In 10 records from GBIF, this species has been collected at elevations ranging from 600 to 3802 ft, with an average (median) of 1148 ft.

Species Range

Hatching behavior

Time of day : Early nighttime

Egg-Laying behavior

Time of day: Dusk

Specimens of the Stonefly Species Paragnetina media

1 Female Adult
3 Nymphs

Start a Discussion of Paragnetina media

References

Stonefly Species Paragnetina media (Embossed Stoneflies)

Taxonomy
Species Range
Resources
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