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.

The Clark's Fork of the Yellowstone River in Wyoming

Stream photos

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Grammotaulius betteni (Northern Caddisfly) Caddisfly Larva Grammotaulius betteni (Northern Caddisfly) Caddisfly Larva

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.

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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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Unidentified trout, Page 3

Mtspinner has attached this picture to aid in identification. The message is below.

Jmd123

Oscoda, MI

Posts: 2474

Jmd123 on Sep 10, 2011September 10th, 2011, 8:42 am EDT

When one is not in trout country, those bluegills, perch, and crappie make fine fly rod quarry. See my "Perch on the fly!" thread - and those came out of a "Designated Trout Lake", in which the trout were not hitting because the surface waters were still to warm so they were down deep. Thus, they provided me with some action while the trout proved unreachable (though they won't be in another month or so as the waters cool).

On the other hand, there is another Designated Trout Lake that I fish for brookies around here that apparently got perch in it through a bait bucket introduction (this is the story I was told anyway) and apparently it was detrimental enough to the trout fishery that the pond was drained for several years to get rid of them. There are still some in there - I've caught a couple on flies and I've seen them on a snorkeling trip there - but the brookies are doing just fine right now. Next time I catch a big perch out there though he may be headed for the freezer, and I'm sure the MI DNR would like that just fine. [UPDATE: a couple of friends of mine told me out there last night that a friend of theirs took 21 perch out of the pond - my only regret is that they didn't end up in MY freezer!]

I've had a number of instances where I have caught trout and warmwater fishes side by side, including a largemouth bass, rock bass, and several sunfish from the Pine River where I have also caught brookies, browns, and rainbows, and also in Missouri and Georgia. But, of course, when one is after trout, it's pretty easy to label everything else as "trash". I pulled a great big creek chub out of the Pine on a grasshopper imitation a couple of days ago, big enough that I did indeed think he was a trout before I saw that big black stripe on his side...I didn't begrudge him though, as I had already caught three trout (a brookie and two browns), and I know his offspring just might end up as trout food!

Jonathon

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