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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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.

This topic is about the Mayfly Species Heptagenia culacantha

This species is not known to be important to anglers. It is noteworthy for its relatively recent discovery, its large size, and the striking coloration of its nymphs and duns. They are sometimes called Tiger Mayflies.

This is the largest species of Heptagenia on the continent, and it's also one of the largest in the entire Heptageniidae family. Nymphs and adult females have been collected with bodies up to a size of 19.5mm, a little over 3/4" long.

Example specimens

Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Oct 20, 2006October 20th, 2006, 2:35 pm EDT
Many thanks to user Softhackle for digging up this link. I knew about the thread from back when it started, but I wasn't able to find it when I went back to look last night. Good work!

Fly Fisherman Magazine forum topic with two pictures of a H. culacantha dun.

I've added the species to the "live" part of the database and put up a rudimentary page where I can compile any more information we find.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Americom8
west chester

Posts: 1
Americom8 on Oct 4, 2007October 4th, 2007, 5:46 am EDT
They are infested in WestChester PA.. Try 1100 West Chester Pike, an apt complex. Infested
G
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Oct 4, 2007October 4th, 2007, 10:18 am EDT
I would think the infestation would be a different species.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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