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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 Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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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Fun day on the Henry's Fork and beyond

Fun day on the Henry's Fork and beyond

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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