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.

Stream photos

Featured on the forum

Re: Trico emergers
In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)

Re: Trico Tips
In the Mayfly Genus Tricorythodes by Martinlf

Re: UV spectrum and trout
In General Discussion by Martinlf

Re: closing the gender gap in flyfishing
In General Discussion by Konchu (Smallflyguy replied)

Re: Fishing Kupa River, Slovenia
In Fishing Reports by Slocum (Fish1 replied)

Grammotaulius betteni (Northern Caddisfly) Caddisfly Larva Grammotaulius betteni (Northern Caddisfly) Caddisfly Larva

Dorsal view of a Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington

This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.

12 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.

Emergers: fuzzy ribbing or smooth ribbing

Byhaugh
Hawaii

Posts: 56

Byhaugh on Mar 31, 2015March 31st, 2015, 5:03 pm EDT

Always differing views, even on the basics....I get it, I think.

Who votes for a smooth bodied emerger, and who votes for a fuzzy one.

Or, would you rib an emerger with the dull side of a goose biot or the shiny side?

Thanks
Byron

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Mar 31, 2015March 31st, 2015, 5:59 pm EDT

Byron, I always like to do the smooth body, but I think it's more for me than the fish.

"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

Byhaugh
Hawaii

Posts: 56

Byhaugh on Mar 31, 2015March 31st, 2015, 6:10 pm EDT

Which most closely imitates the natural?

Planettrout

Los Angeles, CA / Pullman, WA

Posts: 53

Planettrout on Jun 4, 2015June 4th, 2015, 6:35 am EDT

Byron,

I have tied them both ways (fringed and flat) for the Bat Wing Emerger and the trout eat em' all... :)

< />

Those are Flavs...BTW

PT/TB

Daughter to Father: "How many arms do you have, how many fly rods do you need?"

http://planettrout.wordpress.com/

Oldredbarn

Novi, MI

Posts: 2600

Oldredbarn on Jun 7, 2015June 7th, 2015, 2:40 pm EDT

Nice looking flies!

Spence

"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood