Header image
Enter a name
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.

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington
I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.
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.

Siphlonurus autumnalis (Gray Drake) Mayfly Nymph Pictures

This mayfly was collected from Crazy Beaver Spring in Montana on August 31st, 2007 and added to Troutnut.com by Bnewell on June 28th, 2011.

Discussions of this Nymph

Mix-up
2 replies
Posted by GONZO on Jul 2, 2011
Last reply on Jul 2, 2011 by Troutnut
I've really been enjoying looking at Dr. Newell's additions to the "Aquatic Insect Encyclopedia," but there seems to have been some sort of mix-up here. The 2nd photograph is an female ephemerellid dun, possibly something like Ephemerella tibialis.

Start a Discussion of Nymph

Siphlonurus autumnalis (Gray Drake) Mayfly Nymph Pictures

Collection details
Location: Crazy Beaver Spring, Montana
Date: August 31st, 2007
Added to site: June 28th, 2011
Author: Bnewell
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy