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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 Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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 Aug 17, 2013August 17th, 2013, 6:16 pm EDT
Thanks, Eric! Sorry for the late reply - been fishin'...:)
"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
Jmd123
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on Aug 18, 2013August 18th, 2013, 10:00 am EDT
"... been fishin'...:)"

AND??? Results? Posting seems to have slowed down on this site as of late, wondering if everyone else is busy fishing too...I myself am trying to catch up after working two jobs most of the summer...and my main time is still evening into sunset, that's when I am seeing the most flies and as Kurt has informed me in another thread my beloved Light Cahills are still showing up at dusk!

Concerning Tricos, I have never run into them, though I have been informed that they are a morning hatch, a time of day I am rarely on a trout stream just because so much of the hatch activity around here is in the evening (though I will throw hoppers in the afternoon!). I may not also have fished waters that contain them. Are they found everywhere or have more exacting habitat requirements with regards to river size (I fish small streams) or etc.?

Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Aug 18, 2013August 18th, 2013, 6:08 pm EDT
They are found in both large and small streams, but not all streams have them. Ask at local fly shops for the nearest location?
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
TNEAL
GRAYLING. MICHIGAN

Posts: 278
TNEAL on Aug 19, 2013August 19th, 2013, 6:46 am EDT
My best trico fishing (browns 12"-18") came on a feeder stream to Michigan's AuSable. The average width was (maybe) 20'. Very heavy spinner falls with lots of nice fish feeding.

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