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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.
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.

About "Mystery Creeks": If you recognize one of these, you already understand why I'm keeping it a secret. I'm not as strict as some anglers about hiding where I fish, mostly because I don't expect to substantially affect fishing pressure on already well-known or simply unpopular waters. But there are some gems where I don't want to add a single unfamiliar bootprint to the mix, due to the fishing, their wild character, or keeping a friend's secret. They're all "Mystery Creek" here—even the lakes.

Landscape & scenery photos from Mystery Creek # 217

Inviting pool on a sizable river in the Yellowstone backcountry

From the Mystery Creek # 217 in Wyoming
A 15 3/4" Brook Trout, my personal best. I saw this fish chase a smaller one out of the depths of a deep pool, but without a great view I thought it was just a good-sized rainbow. I worked the pool for 15-20 minutes trying to catch that "rainbow" and was thrilled when, after a few minutes of strong fighting, it came close enough for me to see the giant brook trout on the end of my line.
The Mystery Creek # 217 in Wyoming
14 1/2" brook trout -- my 2nd biggest ever.
The Mystery Creek # 217 in Wyoming
The Mystery Creek # 217 in Wyoming
The Mystery Creek # 217 in Wyoming
The Mystery Creek # 217 in Wyoming
The Mystery Creek # 217 in Wyoming
The Mystery Creek # 217 in Wyoming
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