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.

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

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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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Ecdyonurus spp, with Symbiocladius parasites

Millcreek has attached these 3 pictures to aid in identification. The message is below.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Jan 11, 2015January 11th, 2015, 7:07 am EST

These are Ecdyonurus nymphs with Symbiocladius parasitizing them. They were collected from Mill Creek, a tributary of the Russian River. Symbiocladius are a member of Diptera, the true flies. They attach themselves behind the wingpads and grow to maturity there without harming the Ecdyonurus nymph. They parasitize Paraleptophebia and Rhithrogena as well though not in this area.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Jan 11, 2015January 11th, 2015, 7:26 am EST

An added note:
Here is a pdf on Symbiocladius. http://pte.au.poznan.pl/ppe/PPE1-2007/285-291_Gilka_i_in.pdf

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Entoman

Northern CA & ID

Posts: 2604

Entoman on Jan 11, 2015January 11th, 2015, 7:56 am EST

Fascinating, Mark. Are they just attaching themselves for pupation or are they feeding off them?

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on Jan 11, 2015January 11th, 2015, 8:13 am EST

COOL! thanks for posting Mark!

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Jan 11, 2015January 11th, 2015, 10:06 am EST

Kurt-

They feed off them. They attach themselves and feed off haemolymph (bug blood) and associated tissues.

Eric-

You're welcome.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Entoman

Northern CA & ID

Posts: 2604

Entoman on Jan 11, 2015January 11th, 2015, 12:36 pm EST

Thanks, only noticed your link after posting my question. Oh, well...:)

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman