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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.

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.
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Siphlonurus occidentalis (Gray Drake) Mayfly Nymph Pictures

This species emerges very late in the fall often along with Siphlonurus autumnalis just before ice forms on edges of streams.

This mayfly was collected from Crazy Beaver Spring in Montana on November 30th, 2006 and added to Troutnut.com by Bnewell on June 28th, 2011.


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Siphlonurus occidentalis (Gray Drake) Mayfly Nymph Pictures

Collection details
Location: Crazy Beaver Spring, Montana
Date: November 30th, 2006
Added to site: June 28th, 2011
Author: Bnewell
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