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.

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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington

This species was fairly abundant in a February sample of the upper Yakima.

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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.

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Any help with this mayfly?

Canerodder has attached this picture to aid in identification. The message is below.

Canerodder
Posts: 1

Canerodder on May 26, 2009May 26th, 2009, 3:52 pm EDT

Found this guy on a small creek in west Michigan yesterday around 1:30pm....a few ive talked with thought March Brown...but it was very cream colored?

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on May 26, 2009May 26th, 2009, 5:43 pm EDT

Looks like a female M. vicarium dun (March Brown/Gray Fox) to me.

Konchu

Site Editor
Indiana

Posts: 498

Konchu on May 27, 2009May 27th, 2009, 1:30 am EDT

We've had a lot of March Browns out this spring in Indiana. The light color could be because this one just emerged from the nymph stage. It takes them a bit to darken up.

Wiflyfisher

Wisconsin

Posts: 622

Wiflyfisher on May 27, 2009May 27th, 2009, 5:02 am EDT

We've had a lot of March Browns out this spring in Indiana. The light color could be because this one just emerged from the nymph stage. It takes them a bit to darken up.

Just adding to what Konchu is saying... If you ever put your rod down and pick up a seine and capture some duns as they are emerging from their nymphal case you will probably be "dun shrucked" how much lighter they can be at this time.

I have observed that some duns spend too much time sunning themselves and get sun burned easily, which accounts for the color variations.

John S.
https://WiFlyFisher.com

Martinlf