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.
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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.
- 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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Report at a Glance
| General Region | Missouri River |
| Specific Location | Wolf Creek - Craig |
| Dates Fished | June 26 - July 05 |
| Time of Day | 7:00 - 2:00 & 6:00 to dark (10:00) |
| Fish Caught | Wild browns & rainbows |
| Conditions & Hatches | The water was the lowest I'd seen it since my first trip there in 1995. The flow for all ten days was 2700 cfs with a water temperature ranging from 62 - 69 degrees. I'm more accustomed to seeing flows of no less than 4000 cfs to 6000 cfs for this time period and water temperatures from 58 - 64 degrees. Saw good numbers of PMD's but I'd say sporadic and by no meansd blanket emergences. Better spinner falls than the dun emergences. It really doesn't matter because the Missouri trout just do not eat the duns. They much prefer a floating nymph or what we call a Half & Half; soft webby brown hackle tail, PT fibers twisted and wound for the abdomen and ribbed with XF gold wire, PMD color thorax and either a loop wing of light dun CDC or a stubby CDC wing tied in front of the thorax. Excellent cinnamon caddis emergences at dusk lasting to darkness. Sporadic cinnamon caddis activity throughout the day and good spent caddis action too. It was a little early for the epic Trico emergences and spinner falls but I did have fishable duns and spinner falls the least two days (see picture) |
Details and Discussion
Wbranch on Jul 8, 2013July 8th, 2013, 6:07 pm EDT
Low water combined with high daily air temperatures made for difficult conditions. Every day I was there, except my last day hit 90 degrees or higher. Three days when I took a break I looked at the thermometer at a gas station and the temps were 93, 96, & 98. Temperatures like that are withering! By 8:30 I was soaked. I was drinking at least a gallon of liquid every day and it was still probably not enough because I had bad leg cramps three nights.
The low water and high air temperatures, and probably the high amount of boat traffis, were making the aquatic grasses and weeds break off from the plants and there was constantly loose plant life floatng in the water column.
I lost at least 80% of my fish over 18" to grass getting wrapped onto the fly line as the fish were running and either the 5X tippet would break from the sheer weight of 3# - 5# of wet aquatic grass on my line or the grass would sslide all the way down to the fish and the weight, and belly in the line, would literally pull the hook right out of the fish's mouth. I lost one brown almost at the net that was about 22" and another rainbow that was an easy 21".
I still managed some nice fish even under less than ideal conditions. Only one less than 15" trout in ten days, only two that were 16", most of the rest were 17" - 19". Four or five were 20", two were 21.5". I have no idea how many I really caught and to me it is relative. I was having a good time doing what I prefer; casting to rising trout in flat water conditions with dry flies no larger than #18.
The low water and high air temperatures, and probably the high amount of boat traffis, were making the aquatic grasses and weeds break off from the plants and there was constantly loose plant life floatng in the water column.
I lost at least 80% of my fish over 18" to grass getting wrapped onto the fly line as the fish were running and either the 5X tippet would break from the sheer weight of 3# - 5# of wet aquatic grass on my line or the grass would sslide all the way down to the fish and the weight, and belly in the line, would literally pull the hook right out of the fish's mouth. I lost one brown almost at the net that was about 22" and another rainbow that was an easy 21".
I still managed some nice fish even under less than ideal conditions. Only one less than 15" trout in ten days, only two that were 16", most of the rest were 17" - 19". Four or five were 20", two were 21.5". I have no idea how many I really caught and to me it is relative. I was having a good time doing what I prefer; casting to rising trout in flat water conditions with dry flies no larger than #18.
Catskill fly fisher for fifty-five years.
Kschaefer3 on Jul 11, 2013July 11th, 2013, 5:58 am EDT
Great report! Glad you had a good time. Too bad the water conditions weren't a little better for you, but it looks like you found plenty of trout and plenty of nice trout.
Martinlf on Jul 12, 2013July 12th, 2013, 7:59 pm EDT
Some fine fish, Matt.
"He spread them a yard and a half. 'And every one that got away is this big.'"
--Fred Chappell
--Fred Chappell
Oldredbarn on Jul 13, 2013July 13th, 2013, 8:55 am EDT
Great stuff Matt! I'm putting the finishing touches on my getting ready to head out that way myself. I'll be down by West Yellowstone area. I haven't been out since 2004!
Thanks for the boost. :) I'm geeked.
Spence
Thanks for the boost. :) I'm geeked.
Spence
"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively
"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood
"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood
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