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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 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.
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Troutnut.com User Waxsmith (A.K.)

Troutnut.com User Waxsmith (A.K.)

Real Name
A.K.
Location
CANADA
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Biography & Thoughts
Where I live in Canada the only trout there are no native trout other than Lake Trout. We do now, however have some smaller streams and many small lakes stocked for many years already with Brookies as well as Rainbow and Brown trout.To make for a little diversity there are many lakes in this land with Lake Whitefish which can be lots of challenge and fun when hexagania are hatching.Two or three of our large rivers also without trout do hold Goldeyes which are at times madly after Mayfly type of insects mostly in late summer and early autumn. Hey, there is also the odd pike to be caught and eaten I might add;Woolly Bu.... quite often do them in around here(elsewhere probably too). Since in Nov. everything watery freezes up around here there is still the option to catch Jacks (as pike are called around here) through the ice, modified Flashtail Whistlers are quite useful for that purpose. That's it for now. Greetings, Waxsmith.
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What is this supposed to look like, example please.

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