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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 Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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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By Troutnut on October 13th, 2020
On the way home from deer hunting somewhere in Idaho, I had just a couple hours to check out the South Fork Boise River. I drove up and down the canyon for a bit, looking at the water, trying to decide where to stop to fish. Eventually I found some fish rising to some little Baetid duns, and I waded into a bouldery tailout to try for them. They stopped rising pretty quickly, so I switched to my Euro nymphing rig. I hooked two nice rainbows in quick succession, landing a snaky, geriatric-looking 19.5" rainbow and losing one that was a bit shorter but a lot stronger.

Photos by Troutnut from the South Fork Boise River in Idaho

Fishy pool on the South Fork Boise

From the South Fork Boise River in Idaho
The South Fork Boise River in Idaho
19.5 inch rainbow.
The South Fork Boise River in Idaho

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