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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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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FisherOfMen has attached these 7 pictures to this report. The message is below.

Report at a Glance

General RegionSouth Korea
Specific Location"Shit Creek"

Details and Discussion

FisherOfMen's profile picture

Posts: 115
FisherOfMen on Feb 26, 2014February 26th, 2014, 10:55 pm EST
I had a few minutes after class to look around "Shit Creek" as it's called here, the stream/drainage area running through Camp Casey, South Korea.

I found a few dead fish thanks to the ravaging ducks I saw attacking these little buggers! Also a water boatman (I think) and a small mayfly nymph.

Any ID on this fish? It looks like the smelt we used to have in the streams in the Adirondacks in NY. Also - will trout eat those giant water boatmen I found? There's a slew of them in this stream and some much larger than the one I photographed.

Last year I saw some larger fish (10-16 in) but I'm not sure the species, so hopefully I will be able to locate some of those larger fish this season.
"Nothing makes a fish bigger than almost being caught." -Author Unknown

All that is necessary for the triumph of evil is that good men do nothing. -Edmund Burke
Flyfishasia's profile picture
Seoul, South Korea

Posts: 3
Flyfishasia on Jan 29, 2016January 29th, 2016, 9:00 am EST
Fisher Of Men - The fish you found is a Korean pale chub.
They are common in mountain streams in Korea and fight like wet toddlers socks.It looks like a good population still lives in that canal on your base.

I added a link at the bottom of the page to FISH BASE. It has good info on a lot of the species in this region. Its an old site but a good resource.
Lots of fun with nothing else is biting. They are a member of the Cyprinids or carp family. I imagine there are a variety or carp species living in that canal in your photo. Maybe some much larger species as you saw earlier.

The water-boatman was swimming around or crawling on the bottom? It looks to me like a big dragonfly nymph. I could be wrong on that, but I'll call dragonfly on that guy.

The smaller bug is a mayfly. Good ID by the long tail coming out. If you have duty or access to fishing inside the CCL I would certainly take advantage of your privilege to go in and out there. Pressure and over-harvesting, no licensing and poorly enforced regs have a harmful effect on Korea's fisheries.

Be mindful of the constant danger of rogue boxes that get dislodged after heavy rain or tilled fields. I'm sure you've been briefed on that on know what to look for.

Good luck on your scouting

Matt Awalt

- Matt A.
Vprinceii's profile picture
Providence, RI.

Posts: 10
Vprinceii on Feb 13, 2016February 13th, 2016, 11:17 am EST
I recently found a river in western Massachusetts. I am eager to try fishing net location. I took pictures, but the pictures I have don't show the fish I saw there. My question is. Is it normal for fish to swim close to the bank in cold weather?

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