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.

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Female Sweltsa borealis (Boreal Sallfly) Stonefly Adult Female Sweltsa borealis (Boreal Sallfly) Stonefly Adult

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington

I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.

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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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Siphlonurus sp.

Ameletus (Brown Dun) Mayfly Nymph

8 Pictures

Dorsal view of a Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington

Collected June 12, 2019 from the South Fork Snoqualmie River in Washington

Added by Troutnut on June 14, 2019

Collected June 12, 2019 from the South Fork Snoqualmie River in Washington and added by Troutnut on June 14, 2019

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Jan 27, 2020January 27th, 2020, 5:08 am EST

This looks more like an Ameletus species than a Siphlonurus species. At any rate it isn't Siphlonurus because it dosen't have double gills on any segments.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Feb 2, 2020February 2nd, 2020, 6:11 pm EST

Good catch, thanks.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Hex MayfliesHexagenia limbata

Troutnut Forum › Specimen Discussion › Siphlonurus sp.