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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 Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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 dorothea dorothea (Pale Evening Dun) Mayfly Dun Pictures

Ruler view of a Male Ephemerella dorothea dorothea (Ephemerellidae) (Pale Evening Dun) Mayfly Dun from Brodhead Creek in Pennsylvania The smallest ruler marks are 1 mm.
Male Ephemerella dorothea dorothea (Ephemerellidae) (Pale Evening Dun) Mayfly Dun from Brodhead Creek in Pennsylvania
Dorsal view of a Male Ephemerella dorothea dorothea (Ephemerellidae) (Pale Evening Dun) Mayfly Dun from Brodhead Creek in Pennsylvania
Ventral view of a Male Ephemerella dorothea dorothea (Ephemerellidae) (Pale Evening Dun) Mayfly Dun from Brodhead Creek in Pennsylvania
Male Ephemerella dorothea dorothea (Ephemerellidae) (Pale Evening Dun) Mayfly Dun from Brodhead Creek in Pennsylvania
Lateral view of a Male Ephemerella dorothea dorothea (Ephemerellidae) (Pale Evening Dun) Mayfly Dun from Brodhead Creek in Pennsylvania

This mayfly was collected from Brodhead Creek in Pennsylvania on May 27th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

Discussions of this Dun

Small Sulphurs
3 replies
Posted by GONZO on Oct 28, 2008
Last reply on Jul 22, 2014 by Entoman
It's been my suspicion for quite some time that a good part of the credit given to dorothea for creating the later, lighter-colored "little sulphur" hatch should probably go to the same species (or species complex) that creates the earlier, larger, darker hatch--E. invaria. Many anglers who fish the small suphurs on valley limestone streams in my home state believe (or have been led to believe) that they are fishing the dorothea hatch. Close inspection of the mayfly that causes the activity usually doesn't bear that out. Most of the true dorothea hatches seem to come from mountainous areas where the streams are faster and have rockier bottoms.

All of the specimens in this section are from PA, and this seems to provide a good case in point. This specimen and the nymph (#766) are good examples of dorothea, and they both came from sections of the Brodheads in the Poconos. The other specimens came from big limestoners and appear to be invaria. Notice that all of the dun and spinner specimens, except for this one, have banded tails (dark markings at the segments). As far as I know, this is not characteristic of the Eastern version of dorothea (E. dorothea dorothea), but it is a trait of invaria.

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Male Ephemerella dorothea dorothea (Pale Evening Dun) Mayfly Dun Pictures

Collection details
Location: Brodhead Creek, Pennsylvania
Date: May 27th, 2007
Added to site: June 4th, 2007
Author: Troutnut
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