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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

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 Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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.

Partsman has attached these 2 pictures to this report. The message is below.
Brown trout on a mattress thrasher.

Report at a Glance

General RegionNorthern lp, Michigan
Dates Fished06/08/2020-06/09/2020
Time of Daylate afternoon/early evening
Fish CaughtBrown, brook trout
Conditions & HatchesVery warm, a slight breeze during the afternoon. Water levels were safe enough to wade. Lots of caddis and a few mayflies hatching. Also some yellow stoneflies.

Details and Discussion

Partsman's profile picture
bancroft michigan

Posts: 321
Partsman on Jun 9, 2020June 9th, 2020, 11:33 pm EDT
With water levels finally getting to a point that I feel safe wading I decided to head up and fish the afternoon and evening. I also planned to car camp the night and fish the early morning. I had just bought a new rod and reel and wanted to give it try. The early afternoon a few brookies, so after a quick bite to eat at the car I headed backdown to the river. I tied a mattress thrasher and caught a nice brown and a few more brookies. As darkness approached I switched to a brown drake pattern hoping for a hatch or spinner fall. As it got darker there were a few larger rise forms, one I tried to cast to was tight to sweeper with lots brush mixed in, I couldn't get a good cast to it. I then saw a small rise in front of me maybe 15 ft. away, I figured a small brookie but I thought a good way to end the night. Well, that small brookie turned into the biggest brown I have caught. I have not a fish fight like since my steelhead fishing days! I was amazed the 4x tippet held up, as I really had to put the screws to it when it tried to get into bankside logs. The rod in question a Gloomis nrx+ 4 wt. pushed to the max but did the job, Im not sure I will fish at night again with a 4 wt. I quickly took a couple of pics in the net, they don't do the fish justice, but I had a good case of the shakes, and it was pitch dark by now.
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Jun 11, 2020June 11th, 2020, 9:09 am EDT
Love those shakes! Well done.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on Jun 11, 2020June 11th, 2020, 10:16 am EDT
Big beautiful brownie there, Mike! Well done! Estimated size? 18-20"? More??

It's surprising how large a fish can be found mid-stream once it starts getting dark, I've often thought "that's a little guy" and been surprised by a fat boy sitting in less than a foot and a half of water. Ah yes, the challenge of summer evenings, along with keeping the mosquitos out of your face when changing flies in total darkness...but that's when the big browns come out on the prowl! And, big flies are any day now.

My biggest frustration is that deer flies have come out early this year! Repellent will be a constant need from now until September...

Again, congrats! Biggest ever? How big is the one in the top photo, that's a nice one too!

No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Partsman's profile picture
bancroft michigan

Posts: 321
Partsman on Jun 11, 2020June 11th, 2020, 11:21 am EDT
Jonathon, I don't have a tape on me although that is on my list. The fish took the mattress thrasher around 7:00 pm, it was around 15-17 incher. I really try to get fish off the fly and back in the water as quickly as possible. The second fish was taken on the brown drake pattern at about 9:55 pm, my thoughts are it was 20 plus, and such a thick body. I did not at the time but there was witness, he must of come in behind me and he watched the whole thing. I apologized for getting so far down stream but really I could not stop this fish. He was cool with it and since the fish made a couple of nice jumps he got a half way decent look considering the light. I need to work on getting a better camera, although I don't think I would jeapordize a fish for a pic, but still I love to take river pictures and wildlife all around me so it would money well spent. So maybe the hex up next? I don't know, I worry a little more as I have gotten older, especially after my little swim back in early march up there. It really does suck getting older, I never thought I would be getting out of the water in a lot places I would have waded when I was younger, but I do now.
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on Jun 12, 2020June 12th, 2020, 1:14 am EDT
Mike, get a Measure Net! I have both the medium and large sizes now:


You'll always know, good for bragging rights!

Again, that's a big old brownie, not easily fooled. Well done! On both fish!

No matter how big the one you just caught is, there's always a bigger one out there somewhere...

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by Troutnut
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