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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.

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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This topic is about the Mayfly Family Leptohyphidae

Read about the Tricorythodes genus for details. It is very important to trout anglers and it's the only significant trout stream genus in this family.

Most of the other genera are found only in warm waters in Mexico and the Southwest.

Example specimens

Adirman's profile picture
Monticello, NY

Posts: 479
Adirman on Sep 4, 2010September 4th, 2010, 12:22 am EDT
I've never fished a trico hatch before, but I've heard that those bugs are pretty tough to fish. Many guys don't even bother w/ em cause of the size of the flies(20-26). Although I have a few patterns in my box, I've never used them. Is it worth it to fish the tricos?
Portage, PA

Posts: 437
Lastchance on Sep 4, 2010September 4th, 2010, 3:58 am EDT
It just depends on how you look at the idea. I love 'em because they challenge me and I get to test my skills. Plus, I can fish them in the daylight and the hatch can last for months with the right weather. I like competing against them, if one can look at it that way. It's not easy, but I think it's great fun. The small tippet, small flies, the casting that needs to be pretty good, and the absence of micro drag, makes it challenging.
Oldredbarn's profile picture
Novi, MI

Posts: 2600
Oldredbarn on Sep 4, 2010September 4th, 2010, 5:33 am EDT

Well put mister! Many of your points would fairly well discribe why we fly fish in the first place. If someone read your short discription they would have a good view of what it's all about.

"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Sep 4, 2010September 4th, 2010, 9:30 am EDT
What Bruce said.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Adirman's profile picture
Monticello, NY

Posts: 479
Adirman on Sep 4, 2010September 4th, 2010, 12:04 pm EDT
I understand and agree w/ you. Someday, hopefully, oppurtunity will present itself for me to fish them! In the meantime, I have another question: is it the size of the fly that makes it harder to prevent what you guys call "microdrag" as compared to say, fishing a Iso hatch with a 12-16 or so on? Also, why do they say the casting must be more precise than other hatches like Iso?

Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Sep 4, 2010September 4th, 2010, 4:49 pm EDT

A 7X tippet on a #24 fly is proportionally thicker/stiffer than, say, a 5X tippet on a #14. (The #24 is less than half the size of the #14, but the 7X tippet diameter is reduced by only about one third over 5X.) This often causes the tippet to negatively influence the drift: it is harder to create appropriate slack in the tippet, and it behaves more like a rope as it interacts with minute current variations, dragging the little fly. As a consequence, some trico anglers use even finer tippets (8X-10X), but tactics of casting position, placement, and angle are also very important for getting a good drift, and these can sometimes be used to compensate for the effects of a thicker tippet.

Casting accuracy is at a premium because the "attraction distance" (the distance a fish will move to the fly) is often significantly reduced with small flies. The timing of casts can also be critical because many fish will develop a feeding rhythm when lots of flies are on the water. Casts that present the fly (accurately) in sync with that rhythm are more likely to succeed than casts that are out of sync. Accuracy and timing can be especially important with the larger fish.
Adirman's profile picture
Monticello, NY

Posts: 479
Adirman on Sep 6, 2010September 6th, 2010, 12:27 am EDT
I understand and than you. So, I imagine that long distance casts are pretty much out of the question when fishing small flies due to these micro-currents as well?

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Sep 5, 2009
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