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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 Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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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Kinzua
W. PA

Posts: 20
Kinzua on Feb 7, 2009February 7th, 2009, 1:20 am EST
Does any one know if this mayfly is found outside of New Zealand? In particular, is it found in the streams of Hokkaido Japan?

Thanks in advance,
John
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Feb 7, 2009February 7th, 2009, 4:01 am EST
John-

I doubt it, but suggest you pose your question to:

Peter M. Grant, Department of Biological Sciences, Southwestern Oklahoma State University, 100 Campus Drive, Weatherford, Oklahoma 73096-3098 USA, phone (580) 774-3294, fax (580) 774-7140, email peter.grant@swosu.edu.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Konchu
Konchu's profile picture
Site Editor
Indiana

Posts: 498
Konchu on Feb 7, 2009February 7th, 2009, 10:28 am EST
A checklist of Japanese mayflies can be found on this webpage:
http://www.famu.org/mayfly/mfbib_hi.php.

Scroll down to:
Ishiwata S-I. 2001. A checklist of Japanese Ephemeroptera. Pages 55-84 in Bae YJ (ed.) The 21st Century and Aquatic Entomology in East Asia. Proceedings of the 1st Symposium of Aquatic Entomologists in East Asia. The Korean Society of Aquatic Entomology, Korea.

A PDF file is available for download there.
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Feb 8, 2009February 8th, 2009, 3:26 am EST
John-

Based on the Checklist of Japanese Mayflies which Konchu located, the only Oligoneuriid found in Japan is Oligoneuriella rhenana, and it is apparently only found on the island of Honshu.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Kinzua
W. PA

Posts: 20
Kinzua on Feb 8, 2009February 8th, 2009, 4:23 am EST
Taxon and Konchu,
Thank you for your help! Ephemeroptera Galactica - WOW, what a great resource!

John
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Feb 10, 2009February 10th, 2009, 11:11 am EST
John-

Japanese Mayfly Distribution should be a bit easier to use than the .pdf in case you should be curious about the distribution of any more Japanese mayfly species.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Kinzua
W. PA

Posts: 20
Kinzua on Feb 14, 2009February 14th, 2009, 8:59 am EST
Double WOW! and thanks.

John

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