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The Specimen

Isoperla (Stripetails and Yellow Stones) Stonefly AdultIsoperla (Stripetails and Yellow Stones) Stonefly Adult View 10 PicturesSeveral stoneflies of this species were flying around a small stream last night. I tied on a brown drake imitation of about the right size/color to approximate these stones, and was rewarded with a hard-fighting 17-inch brown trout.
Collected July 7, 2006 from Cayuta Creek in New York
Added to by on July 8, 2006

The Discussion

TroutnutJuly 30th, 2006, 7:49 am
Bellevue, WA

Posts: 2737
I haven't had time to look through my stonefly keys yet. It's a pretty small yellow fly, so I'm guessing Chloroperlidae, though I have no real reason to rule out Perlodidae.

I've saved it in alcohol to key out under a microscope at some later date, but it'll be a while before I have time.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
TaxonJuly 30th, 2006, 12:24 pm
Site Editor
Royse City, TX

Posts: 1350

Likely Isoperla, perhaps I. bilineata.
Best regards,
Roger Rohrbeck
TroutnutJuly 30th, 2006, 12:58 pm
Bellevue, WA

Posts: 2737
Ok, I'll move it over to Isoperla for now. According to Swisher and Richards, bilineata is an olive and brown species, so I don't think it's that one. This one is distinctly yellow; the brown accents are exaggerated a bit in the photo processing because it just looks so cool.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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