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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.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Artistic view of a Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Dun from the Marengo River in Wisconsin
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Jun 26, 2006June 26th, 2006, 10:22 am EDT
Jason-

Wow, believe these are the first photos I've seen of winged Baetisca. They certainly have a stout abdomen, don't they. Guess that shouldn't be a particular surprise given the shape of the nymphs, but must admit it startled me.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Jun 26, 2006June 26th, 2006, 4:51 pm EDT
I was surprised, too, when I first collected one. I almost instantly knew it had to be Baetisca, but it was still very neat to see. Interestingly, the males are quite a bit less robust -- about half-way between the female Baetiscas and the typical sulphur spinners.

The pretty wing patterns of the duns aren't carried over into the spinners, which have unmarked hyaline wings. Since the spinners are the stage to imitate, people should take note of this difference.

Another interesting thing about Baetiscas is that the males, at least in the spinner stage, aren't as stout as the females. They're still more robust than other mayflies, but it takes a close look to notice the difference.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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