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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 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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Troutnut.com User Flymom (Catskill Fly Fishing Center & Museum)

Troutnut.com User Flymom (Catskill Fly Fishing Center & Museum)

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Catskill Fly Fishing Center & Museum
Catskills - Livingston Manor, NY
Biography & Thoughts
We are a nonprofit, educational organization dedicated to preserving America’s flyfishing heritage, teaching its future generations of flyfishers, and protecting its flyfishing environment. We carry out this mission by operating a museum, an education center and, in the near future, an environmental research center. We seek to increase public awareness of the values of fly fishing, prime among which is respect for the natural environment. We provide a meeting place for anglers to share their ideas and experiences, improve their skills, and enhance their enjoyment of the sport of fly fishing.

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