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Blue-winged Olives

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.

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Female Isonychia bicolor (Mahogany Dun) Mayfly Dun Pictures

This mayfly was collected from the Namekagon River in Wisconsin on June 14th, 2005 and added to Troutnut.com by Troutnut on May 26th, 2006.

Discussions of this Dun

Isos with green edged wings
3 replies
Posted by Kenlindblom on Jul 26, 2013
Last reply on Jul 28, 2013 by Martinlf
I have seen Isos with the forward edge of their wings an olive color. These were also on the upper East Branch. I tied some using a permanent marker to tint the leading edges olive. But, it seems that the standard pattern works as well.
Iso dun
16 replies
Posted by Wbranch on Feb 12, 2010
Last reply on Jun 5, 2010 by Vinlflyfish
In Paul Weamer's book (page 190) "Fly Fishing Guide to the Upper Delaware River" he writes "Some Upper Delaware Isonychias are bright green when they first emerge. They eventually change into their reddish purple to grayish pink color as they are exposed to the air". I'd like to tie some of these but would like to see a decent picture of the adult insect as it first emerges. Anyone have any pictures with the bright green abdomen?

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Female Isonychia bicolor (Mahogany Dun) Mayfly Dun Pictures

Collection details
Location: Namekagon River, Wisconsin
Date: June 14th, 2005
Added to site: May 26th, 2006
Author: Troutnut
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