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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
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.

Dorsal view of a Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington
Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.
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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Male Ephemerella invaria (Sulphur) Mayfly Dun Pictures

Lateral view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania
Artistic view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania
Ruler view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania The smallest ruler marks are 1 mm.
Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania
Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania
Ventral view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania

This mayfly was collected from the Little Juniata River in Pennsylvania on May 25th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

Discussions of this Dun

need a good pattern
1 replies
Posted by Anttam on May 19, 2008
Last reply on Jan 7, 2009 by Phishheaduj
any cdc patterns you nuts know of for Sulfpurs?
looking for a site with instructions or any help

Start a Discussion of Dun

References

Male Ephemerella invaria (Sulphur) Mayfly Dun Pictures

Collection details
Location: Little Juniata River, Pennsylvania
Date: May 25th, 2007
Added to site: June 4th, 2007
Author: Troutnut
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