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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Feb 3, 2010February 3rd, 2010, 7:08 am EST
Here's the next picture in the Name That Spot series, from the Catskills:



(Link to full-size)
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Junior
Posts: 1
Junior on Feb 3, 2010February 3rd, 2010, 7:56 am EST
Hi Jason,

Looks like below the fast water on powerline pool but just above the bend on the Willi with the Quickway up on the ridge in the background.

junior
Troutnut
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Bellevue, WA

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Troutnut on Feb 3, 2010February 3rd, 2010, 11:14 am EST
You got it!
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Wbranch
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York & Starlight PA

Posts: 2635
Wbranch on Feb 3, 2010February 3rd, 2010, 12:19 pm EST
Good job Junior! I had my eyes glued to an Ebay auction I was following today and didn't get a chance to see that Jason was running the "Name that Spot" thread. That is the sectionof the Willow that I first fished back in 1970. I used to park my 1969 VW Campmobile under the power lines right up at the rivers edge and stay there all weekend.
Catskill fly fisher for fifty-five years.
Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Feb 3, 2010February 3rd, 2010, 4:33 pm EST
Yeah, this is a pretty recognizable spot. I figured the angle and narrow field of view of this picture might make it a little bit trickier to guess, but you guys know that river too well!
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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