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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

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.
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Baetisca (Armored Mayfly) Mayfly Nymph Pictures

I've only got blurry pictures of this small Baetisca nymph, because it was zooming around the container in a frenzy. Several characteristics, if taken literally, suggest that it may be Baetisca lacustris. However, it's very small and it's the only candidate lacustris I collected among several laurentina specimens, so it's possible this is just an underdeveloped early instar laurentina.

Video Clip

Swimming Baetisca Mayfly Nymph

The clumsy-looking mayfly nymphs of the genus Baetisca are surprisingly good swimmers.

This mayfly was collected from unknown in Wisconsin on January 14th, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.

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Baetisca (Armored Mayfly) Mayfly Nymph Pictures

Collection details
Location: unknown, Wisconsin
Date: January 14th, 2004
Added to site: January 25th, 2006
Author: Troutnut
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