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.
Millcreek on Feb 21, 2018February 21st, 2018, 6:50 am EST
I've had the Isoperla species in here before but it was dead when photographed and these are live. Species were identified to genus using "An Introduction to the Aquatic Insects of North America" by Merritt, Cummins and Berg (2008). They were identified to species using "The Isoperla of California (Plecoptera: Perlodidae) Larval Descriptions and a Key to 17 Western Nearctic Species" by J.B. Sandberg.(2011). http://www2.pms-lj.si/illiesia/papers/Illiesia07-22.pdf
And "New Descriptions of North American Taenionema Larvae (Plecoptera; Taeniopterygidae)" by K.W. Stewart (2009).http://www.zobodat.at/pdf/Illiesia_05_0128-0145.pdf
The nymphs were collected 2/20/18 in shallow, fast water with small to medium gravel. The Isoperla marmorata was 13-15 mm and the Taenionema pacificum was 9-12 mm.
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