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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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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BDK has attached these 2 pictures to aid in identification. The message is below.
BDK
BDK's profile picture
dfw , Texas

Posts: 1
BDK on Jun 3, 2014June 3rd, 2014, 9:50 am EDT
We where using a seine this weekend there where alot of these in the river can not identify it . Help would be most appreciated
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Jun 3, 2014June 3rd, 2014, 12:25 pm EDT
Welcome to the forum, BDK.

Those are Isonychia (Leadwing Coachman) mayfly nymphs.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
PaulRoberts
PaulRoberts's profile picture
Colorado

Posts: 1776
PaulRoberts on Jun 3, 2014June 3rd, 2014, 6:00 pm EDT
Yes! Strong swimmers they are. Welcome.

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