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.

This is one of the many shallow, unnamed lakes in the Arctic coastal plain near the Dalton Highway.

From Dalton Highway in Alaska

Stream photos

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Female Skwala (Large Springfly) Stonefly Adult Female Skwala (Large Springfly) Stonefly Adult

Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 in Washington

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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.

Timpanoga hecuba

Leskorcala has attached these 4 pictures to aid in identification. The message is below.

Leskorcala
Posts: 16

Leskorcala on Sep 10, 2020September 10th, 2020, 5:16 pm EDT

This is largest mayfly of the Late summer / fall season on the Montana waters. On my home river Bitterroot river this big fall drake mayfly hatches during the day. They are big size 10-12 hook size and floating long ways on the surface before wild trout switch from sipping PMD or BWO and take this big dun.

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Sep 13, 2020September 13th, 2020, 7:52 am EDT

Cool photos. Thanks for posting!

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

--Fred Chappell

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Sep 14, 2020September 14th, 2020, 7:31 am EDT

Nice photos Les!

I still haven't had any luck finding hecuba adults to photograph myself... never quite in the right time/place. I do have a nymph on here, which I collected in late August on the Bitterroot a couple years ago.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Leskorcala
Posts: 16

Leskorcala on Sep 23, 2020September 23rd, 2020, 5:24 pm EDT

Thank you Martin and Jason,
Living by the river allows me to find them. I am just about everyday by the water and noticed that hecuba adults do drift in afternoon hrs and mostly on cloudy, cooler and even rainy days. All my samplings are from the Bitterrot river. I need to collect few nymphs. If you need any reference of the adult i have many of them.