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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

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.
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Lateral view of a Female Isonychia bicolor (Isonychiidae) (Mahogany Dun) Mayfly Dun from the Namekagon River in Wisconsin
Posts: 2
Kenlindblom on Jul 26, 2013July 26th, 2013, 5:24 pm EDT
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.
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Jul 26, 2013July 26th, 2013, 6:52 pm EDT
Welcome aboard, Ken. Isonychia seem to come in a wide variety of wing colors. Sounds like the ones you observed on the upper East Branch may have looked something like this:

Incidentally, you might want to update your profile with location info so folks aren't forced to guess what part of the world you are from.

Best regards,
Best regards,
Roger Rohrbeck
Posts: 2
Kenlindblom on Jul 27, 2013July 27th, 2013, 8:57 am EDT
The leading edges were a much more prominent green, covering about 25-30 %. The green was quite bright, not a subdued olive.
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Jul 28, 2013July 28th, 2013, 6:02 am EDT
Upper East Branch of the Delaware?

The Iso body colors seem to vary a great deal as well, from green to gray to dark brown.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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