Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Two major forks of this grayling stream come together in this pretty pool.

From the Chena River in Alaska

Stream photos

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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.

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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