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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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Wystone has attached this picture. The message is below.
Posts: 1
Wystone on Aug 12, 2007August 12th, 2007, 3:57 am EDT
Identication help? Center Maine region ( NW of Bangor). Picture taken early July.
Screen openings 2mm
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Aug 12, 2007August 12th, 2007, 4:11 am EDT
I'll leave the ID to the professionals, but great photo and measurement idea.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Aug 12, 2007August 12th, 2007, 8:06 am EDT
Male spinner. Isonychia ?

Yes, it would appear to be. There are (at least) three Isonychia species recorded from Maine, I. bicolor, I. georgiae, and I. obscura. Although the greatest statistical likelihood would be I. bicolor, reliable identification to species requires microscopic examination of male imago genitalia.

Luckily, we have a mayfly entomologist actively participating on this forum, who is qualified to make such an identification, if sent a preserved specimen. See this thread.
Best regards,
Roger Rohrbeck
JAD's profile picture
Alexandria Pa

Posts: 362
JAD on Aug 12, 2007August 12th, 2007, 1:49 pm EDT

If I could taste it, I could tell you :) nice picture.


They fasten red (crimson red) wool around a hook, and fix onto the wool two feathers which grow under a cock’s wattles, and which in colour are like wax.
Radcliffe's Fishing from the Earliest Times,

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