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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 Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington
Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.
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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Bfdfisher
Posts: 1
Bfdfisher on May 26, 2011May 26th, 2011, 5:50 pm EDT
This was the hatch of the night on 25 May 2011. It was epic....yet nothing was rising or visibly feeding. Not really positive what it is. It could be a Hendrickson, it's just so dark and eyes are so red. All the bugs coming off had the same strikingly red eyes.
Thanks all
PaulRoberts
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Colorado

Posts: 1776
PaulRoberts on May 26, 2011May 26th, 2011, 7:10 pm EDT
Male Ephemerellids of some type. Late for subvaria unless you are up north. Early for Seratella me thinks.

Where are you?
What size (hook size) were they?
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on May 27, 2011May 27th, 2011, 12:36 am EDT
If you click the "edit" link above your post, you'll see an option to attach your picture... that'll potentially help us with the ID.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
PaulRoberts
PaulRoberts's profile picture
Colorado

Posts: 1776
PaulRoberts on May 27, 2011May 27th, 2011, 6:06 am EDT
I'm going to guess right now:

Serratella deficiens/tibialis -#16 chocolate dun with nearly black wings, pale legs, and red eyes on males.

If not such dark wings and a dark olive body then mebbe a Drunella.

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