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.
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This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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I'm a salmonid research scientist with the Washington Department of Fish and Wildlife since 2022. I completed my Ph.D. in 2014 at the University of Alaska. I created Troutnut.com in February 2004 and worked on it full-time during various short breaks from school and work.
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Easy tips to tell Callibaetis and Siphlonurus nymphs apart?
In Couplet 9 of the Easy Angler's Key to Common Mayfly Nymphs by Troutnut
In Couplet 9 of the Easy Angler's Key to Common Mayfly Nymphs by Troutnut
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