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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.

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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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By Troutnut on July 31st, 2020
I fished the Henry's Fork of the Snake out of the Last Chance access on the Harriman Ranch section from 8:30 to 11:00 am. Fishing was difficult, I caught a 14-incher on a size 18 olive Galloup's Cripple dry, and I missed three other strikes or close refusals. There were obscenely many mayfly spinners on the water, mostly Ephemerella excrucians PMDs but also a few Baetis, Tricorythodes, and Siphlonurus occidentalis. However, very few fish rose more than once or twice, and they were picky when they did. Most of the action was from 10 to 11 pm. After fishing, I set up in the parking lot to photograph bugs during the heat of the day.

I drove a long way to a secret spot to fish for the evening. However, it wasn't as secret as I'd like. Several vehicles at the usual access point compelled me to look elsewhere, and I drove to somewhere I'd have more of a walk to avoid people. At first I caught some brook trout and a small whitefish, including a nice 14 1/8" brookie. I thought maybe the other fish I was after were not to be found in this part of the creek. However, on the last pool before I was going to give up and move, an 18.5" cutthroat slammed my Royal Doublewing and put up a great fight. A smaller one tried to hit in the same pool.

In the next pool up, I hooked an even bigger one, at least 20", and fought it for over five minutes before the hook came loose. I took these back-to-back fish as a sign that the fishing was heating up, but that was the last sign of big cutts. As a more-than-great consolation prize, I caught my largest brook trout ever (16 1/8") and six brookies in the 10–12" range. All the fishing really shut down 1–2 hours before dark.

Photos by Troutnut from the Henry's Fork of the Snake River and Mystery Creek #237 in Idaho and Montana

The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
Mystery Creek # 237 in Montana
Mystery Creek # 237 in Montana
Mystery Creek # 237 in Montana
This brook trout measured a bit over 14".
The only mountain whitefish of the trip. I caught it nymphing the bottom of a pool so deep I could tell there were fish but couldn't tell what kind. They were whitefish.
My longest brook trout yet, 16 1/8".
Mystery Creek # 237 in Montana
Mystery Creek # 237 in Montana

Closeup insects by Troutnut from the Henry's Fork of the Snake River and Mystery Creek #237 in Idaho and Montana

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