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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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Landscape & scenery photos from the South Fork Stillaguamish River

The South Fork Stillaguamish River in Washington
The South Fork Stillaguamish River in Washington
The South Fork Stillaguamish River in Washington
The South Fork Stillaguamish River in Washington
The South Fork Stillaguamish River in Washington
The South Fork Stillaguamish River in Washington
The South Fork Stillaguamish River in Washington
The South Fork Stillaguamish River in Washington

Closeup insects by Troutnut from the South Fork Stillaguamish River in Washington

Lateral view of a Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Dun from the South Fork Stillaguamish River in Washington
This one was collected in association with a male spinner, but they appear to be different families.
Lateral view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
I'm unsure of the ID on this one; keys put it closest to Cinygmula reticulata, but I'm very doubtful of the species and not positive on the genus. Epeorus is another possibility, but I don't know which species it would be.

This one was collected in association with a female dun probably of a different family.
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