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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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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Leskorcala has attached these 4 pictures to aid in identification. The message is below.
Posts: 16
Leskorcala on Feb 25, 2020February 25th, 2020, 2:16 am EST
I belie this is small BWO family Baetidae nymph , very small in looks like immature stage since the wing pads are still lighter color. came out of slow water from Bitterroot River in Montana
Healdsburg, CA

Posts: 344
Millcreek on Mar 6, 2020March 6th, 2020, 4:22 am EST
You might try putting your nymphs in water or alcohol and submerging them, then taking photos. This will allow gills, tails and antennae to float free and be seen better.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Posts: 4
Swpabrown on Mar 6, 2020March 6th, 2020, 9:10 am EST
brown trout snack

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