Header image
Enter a name
Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

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 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.
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.

Posts: 1
Albz on Oct 4, 2008October 4th, 2008, 3:01 pm EDT
had a 30 fish day just browns.
7-12 inches on zug bug under a indicator up a foot
Auburn, CA.

Posts: 2
Odamark on Jun 7, 2009June 7th, 2009, 10:57 am EDT
Went late afternoon, overcast and about 52 degrees. No water coming down from the spillway. Lots of little fish (5 inches). Used a "zub bug" (#18) with an indicator. The hike was fun but not really worth making an out-of-the-way trip.
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Jun 10, 2009June 10th, 2009, 3:14 pm EDT
Never fished it; were they stockies, or wild?
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Auburn, CA.

Posts: 2
Odamark on Jun 11, 2009June 11th, 2009, 6:06 am EDT

I am not going to blow smoke, I am so new to identifying fish I'd probably get it wrong anyways! LOL I am going to guess wild in the sense that their color and size weren't of the "stock" type I found at "Forebay" Reservoir (which is located write outside the main road {Carson Road} across from the Safeway in town).

A biologist friend told me at one time there were some big Browns down there, that was not the case for me.

Quick Reply

Related Discussions

Last Reply
Apr 29, 2007
May 1, 2014
by Wbranch
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy