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> > Any help with this mayfly?

Canerodder has attached this picture to aid in identification. The message is below.
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CanerodderMay 26th, 2009, 7:52 pm
Posts: 1Found 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?

GONZOMay 26th, 2009, 9:43 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Looks like a female M. vicarium dun (March Brown/Gray Fox) to me.
KonchuMay 27th, 2009, 5:30 am
Site Editor

Posts: 496
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.
WiflyfisherMay 27th, 2009, 9:02 am

Posts: 603
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.
MartinlfMay 27th, 2009, 12:56 pm
Palmyra PA

Posts: 2879
Also check the dorsal and ventral sides for the difference in color to consider what the fish sees.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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