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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.

The Middle Fork of the Koyukuk River in Alaska

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Sweltsa (Sallfly) Stonefly NymphSweltsa (Sallfly) Stonefly Nymph
Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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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Drunella grandis (Western Green Drake) Mayfly Nymph
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Lateral view of a Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Added by Troutnut on July 12, 2020
Collected July 5, 2020 from the Dosewallips River in Washington and added by Troutnut on July 12, 2020
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Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Aug 14, 2020August 14th, 2020, 3:30 am EDT
Love the detail here, Jason. Those spikes on the head and abdomen are cool. Horned mayfly.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Aug 14, 2020August 14th, 2020, 6:49 am EDT
Yeah, Drunella grandis is a cool-looking mayfly! Check out Drunella spinifera, which takes those features to an even greater extreme.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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