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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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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Manitoba Canada

Posts: 19
Willmilne on May 18, 2009May 18th, 2009, 12:49 pm EDT

I have recently uncovered a locale with recorded collection records for both these species and am keen to collect and photograph specimens.Nymphs and adults . I have light traps/emergence traps for the adults but...

Does anyone have suggested substrate/stream location preferences for the nymphs? For P.vittigera all I can find is a preference for clay banks and T.primus nada.

Any help would be deeply appreciated.


Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on May 18, 2009May 18th, 2009, 5:44 pm EDT

Both species apparently burrow in clay banks. Berner (1988) offers some information. He quotes Scott et al. (1959) describing the substrate preferred by Tortopus in the Savannah River:
"The clay substrate inhabited by Tortopus is always firm, nearly always vertical, and usually exposed to swift water."
Berner notes that the burrows enter the bank at right angles forming U-shaped tubes with parallel arms. In the description of Pentagenia, he mentions this:
McCafferty (1975) collected nymphs in hard clay banks approximitely three feet below the water surface in the Wabash River in Indiana. He found the clay banks to be honeycombed by Pentagenia nymphs in the same manner that the banks of the Savannah River are honeycombed by Tortopus.
Konchu's profile picture
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Posts: 498
Konchu on May 19, 2009May 19th, 2009, 6:07 am EDT
If you're not afraid of hard work and possibility of drowning, go for it! It takes some hard digging...
Manitoba Canada

Posts: 19
Willmilne on May 19, 2009May 19th, 2009, 11:52 am EDT
Thank you for the info. that helps a great deal as the locale offers some accessible spots that would match those descriptions.

Konchu- the work is not a problem - drowning might put a serious damper on my summer plans:)))

Manitoba Canada

Posts: 19
Willmilne on May 19, 2009May 19th, 2009, 2:55 pm EDT
Thanks for the mention of Berner and McCafferty - I found some info on the FAMU site that will be a great help.


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