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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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This topic is about the Mayfly Genus Cinygma

This uncommon Western genus is closely related to Cinygmula. It rarely provides good hatches.

Example specimens

Bnewell
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Site Editor
Kennewick, Washington

Posts: 115
Bnewell on Jul 15, 2011July 15th, 2011, 12:20 pm EDT
Perhaps one reason Cinygma mayflies do not create much interest for fishermen is because of their habit. They seem to prefer these small headwater streams, often streams without trout.
Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Jul 15, 2011July 15th, 2011, 12:23 pm EDT
Thanks Bob. I've never seen one of them and wondered where I might find them. There are records of two species of Cinygma in the Fairbanks area, though, so I'll keep a close eye out for them in my samples and maybe try some little headwaters.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Entoman
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Northern CA & ID

Posts: 2604
Entoman on Jul 19, 2011July 19th, 2011, 11:00 pm EDT
It's interesting that it is perching like an ephemerillid.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

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