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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.

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Mar 26, 2013March 26th, 2013, 1:19 pm EDT
Jere -

In the Grannom thread you posed some baetid questions. I thought it best to address them in a separate thread.

Punctiventris remains a valid species name but it has been moved to the genus Plauditus from Pseudocloeon. As Louis correctly stated, nothing trumps local knowledge but I believe your bright green tiny baetids are most likely another ex-Pseudocloeon, Iswaeon anoka. There is a lot of confusion about the distribution of the similar looking P. punctiventris which is mostly a Southwestern species. The other species that can be confused with them is Acentrella turbida but it is chunkier and more somber in coloration. In any event all three are commonly called Tiny Western Olives. Check out this link in the hatch pages: http://www.troutnut.com/hatch/198/Mayfly-Pseudocloeon-Tiny-Blue-Winged-Olives
I updated this page with a new chart last year to assist us in sorting out what happened to all the species in this previously important genus.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Sayfu
Posts: 560
Sayfu on Mar 26, 2013March 26th, 2013, 2:22 pm EDT

The only question I had regarding Craig Mathews description of this Fall Baetis being bright green bodied for the females was everyone that I captured during the emergence was bright green. Odds seemed against that happening. and Mathews', and Juracak's book, Yellowstone Hatches, was written some year's back. And the unusual aspect of all of that was on my first Fall Baetis fishing trip fish would not accept my darker olive pattern, but readily accepted them once I tied them in the bright green.
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Mar 26, 2013March 26th, 2013, 3:10 pm EDT
Sorry about that. I thought you asked if P. punctiventris had been synonymized with B. tricaudatus. Suffice to say (without getting any further into the weeds than we already have) this doesn't mean that Matthews book is wrong as about the time he wrote it puntiventris and anoka were briefly speculated to be synonymous and the genus situation was in a serious state of flux. A lot of angler hatch charts still report the older names. I'm having a deja vu moment here as I seem to remember a similar conversation on this topic with Gonzo & you a few years ago.:)

As to your point about the fish being color selective to bright green in this instance (as well as the Grannoms), I agree as I have experienced the same thing.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

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