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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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.

This topic is about the True Fly Family Simuliidae

Black flies are not usually regarded as important trout fare, but scientific studies of some rivers have shown them to make up the majority of the trout's diet. Such places are few and far between, but anglers should be aware of the possibility and keep a lookout for high concentrations of the larvae.

The adults are nasty, annoying, biting flies.

Example specimens

Mushroom
Posts: 1
Mushroom on Sep 22, 2014September 22nd, 2014, 12:55 am EDT
Thank you for the nice quality pictures. I want to use your picture in my personal presentation in my science class. Would you mind this? I will wait your answer. thank you.
Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Sep 23, 2014September 23rd, 2014, 11:29 am EDT
Yes, you can use my pictures in a science class for free.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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