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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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Sglidster has attached these 3 pictures to aid in identification. The message is below.
Sglidster
Posts: 3
Sglidster on Feb 23, 2012February 23rd, 2012, 8:41 am EST
Thanks for the ID on the last pic.

I'm pretty sure these are:

1. Ecdyonurus torrentis - large brook dun

2. Plecoptera perlodidae - yellow sally

3. Baetis muticus - Iron blue

4. Hydropsyche

Am I OK with these?

Thanks,

Simon
Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Feb 23, 2012February 23rd, 2012, 5:00 pm EST
I don't know my UK species, and some (like Hydropsyche) might be hard to tell apart from close relatives in those pictures, but within those limitations your IDs look good to me. Hopefully somebody who betters knows the UK can chime in.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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