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.

For how many years, I wonder, have these huge slabs of rock sheltered wild brook trout?

From Mystery Creek # 89 in New York

Stream photos

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Tricorythodes (Trico) Mayfly Nymph Tricorythodes (Trico) Mayfly Nymph

Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Mystery Creek #308 in Washington

9 Recently Added Photos

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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

This is not Ephemera simulans

Hexagenia limbata (Hex) Mayfly Nymph

4 Pictures

Dorsal view of a Hexagenia limbata (Ephemeridae) (Hex) Mayfly Nymph from the Marengo River in Wisconsin

Collected June 4, 2005 from the Marengo River in Wisconsin

Added by Troutnut on May 25, 2006

Collected June 4, 2005 from the Marengo River in Wisconsin and added by Troutnut on May 25, 2006

Beardius
Posts: 19

Beardius on Aug 1, 2008August 1st, 2008, 6:45 am EDT

This looks to be either Hexagenia or Litobrancha based upon the frontal process being rounded and not forked. Probably is Hexagenia based upon where it was collected and Hexagenia being so widespread and common, but I cannot tell from the photo if the gill on the first abdominal segment is forked or single from these photos.

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Aug 1, 2008August 1st, 2008, 10:26 pm EDT

You're right. I can't see how I would possibly have misidentified this one, so I must have just absent-mindedly clicked it into the wrong category when I added it to the site.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist