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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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Al514 has attached these 3 pictures. The message is below.
Al514
Al514's profile picture
Central New York

Posts: 142
Al514 on May 12, 2014May 12th, 2014, 6:09 pm EDT
Anyone else have pictures of Brown Trout with Red spots on it's dorsal? I'm just wondering how rare it is, if it is specific to this creek, or maybe if I just haven't noticed it before?
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on May 15, 2014May 15th, 2014, 3:40 pm EDT
No. It is quite common in the German influenced strains. Ive even seen 'em on the adipose fin. Your fish sure is a pretty little guy.
"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
Kschaefer3
Kschaefer3's profile picture
St. Paul, MN

Posts: 376
Kschaefer3 on May 16, 2014May 16th, 2014, 6:13 am EDT
Your fish sure is a pretty little guy.

Yes it is! I love when they get tons of red like that.

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