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.

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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington

This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.

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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.

Olives

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on May 1, 2009May 1st, 2009, 1:53 pm EDT

I don't have a photo, but fishing a central PA stream yesterday I encountered a hatch of size 20 olives late afternoon into early evening. Would anyone out there hazard a guess as to the species given the time of day and time of year?

"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on May 1, 2009May 1st, 2009, 3:57 pm EDT

Louis-

My guess would be Acentrella turbida (formerly classified as Pseudocloeon carolina among others), and an early-May late-afternoon/evening emerger, which would be of the size you describe.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Konchu

Site Editor
Indiana

Posts: 498

Konchu on May 2, 2009May 2nd, 2009, 5:00 am EDT

I agree. At least around here, the Acentrella have been thick this spring. The other possibility are some Plauditus spp. These also were included in Pseudocloeon at one time. The biggest visual difference between the two is the color of the abdomen: brown in Acentrella and whitish in Plauditus. The nymphs look alot a like, too: they both are two-tailed minnow-like forms, but the plauditus might have a stripe in the middle of the body and tails.

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on May 3, 2009May 3rd, 2009, 5:36 pm EDT

Thank you, gentlemen.

"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell