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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.

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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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Leskorcala has attached these 4 pictures to aid in identification. The message is below.
Posts: 16
Leskorcala on Sep 10, 2020September 10th, 2020, 5:16 pm EDT
This is largest mayfly of the Late summer / fall season on the Montana waters. On my home river Bitterroot river this big fall drake mayfly hatches during the day. They are big size 10-12 hook size and floating long ways on the surface before wild trout switch from sipping PMD or BWO and take this big dun.
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Sep 13, 2020September 13th, 2020, 7:52 am EDT
Cool photos. Thanks for posting!
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on Sep 14, 2020September 14th, 2020, 7:31 am EDT
Nice photos Les!

I still haven't had any luck finding hecuba adults to photograph myself... never quite in the right time/place. I do have a nymph on here, which I collected in late August on the Bitterroot a couple years ago.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Posts: 16
Leskorcala on Sep 23, 2020September 23rd, 2020, 5:24 pm EDT
Thank you Martin and Jason,
Living by the river allows me to find them. I am just about everyday by the water and noticed that hecuba adults do drift in afternoon hrs and mostly on cloudy, cooler and even rainy days. All my samplings are from the Bitterrot river. I need to collect few nymphs. If you need any reference of the adult i have many of them.

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