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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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Report at a Glance

General RegionLower Susquehanna
Time of Day1:00 - 4:00
Fish CaughtFifteen smallmouth 15" - 19"

Details and Discussion

Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Oct 13, 2009October 13th, 2009, 10:03 am EDT
Had a great day and all the fish fought like demons.

Catskill fly fisher for fifty-five years.
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Oct 13, 2009October 13th, 2009, 1:03 pm EDT
Oh yeah, glad you found them Matt. Clousers?
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Portage, PA

Posts: 437
Lastchance on Oct 17, 2009October 17th, 2009, 12:49 am EDT
Great fish! I have to spend more time on smallmouths next year. Is the Susquehanna rebounding from its woes of a few years ago? I know Bob Clouser hasn't booked trips for a few years.
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Oct 23, 2009October 23rd, 2009, 8:43 am EDT
Hello Lastchance,

The river still fly fishes poorly from Harrisburg south through the summer but as soon as there are a few cool nights and the river temperature drops the bass seem to really turn on.
Catskill fly fisher for fifty-five years.

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