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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By Troutnut on June 5th, 2020
Saturday I drove east from the rainy Seattle side of the Cascades to seek sunnier weather and take some friends on their first flyfishing trip. We went to a small stream where I've caught small trout from a meadow with plenty of backcast room, but unfortunately the water up there at 4,400 feet was still high and too cold from runoff. I like to think I could have found a few fish on nymphs on a solo trip with lots of time to kill. However, being focused on teaching, I only fished myself long enough to tell that the fishing wasn't going to be much good yet (i.e., I caught nothing in a few promising spots).
We moved on to a high lake, Taneum Lake, mostly just for the easy, scenic hike. We saw a few cutthroat trout cruising around, but it was not a good lake to flyfish from shore. I had brought my packraft, but nobody else much felt like paddling around on the lake when the wind picked up and snow started to fall. I might have fared better with a spinning rod. The fish did try to hand me one opportunity on a silver platter, but I blew it by failing to have the right setup when opportunity struck. I was rigged up with a heavily-weighted fly and sink-tip line from a deep shoreline when I walked up toward a shallower area and spotted a cruising fish. It paused behind an isolated boulder as if it were trying to give me the perfect opportunity to sneak into a good casting position, so I did. There was no time to change flies, so my heavy dragonfly nymph dropped into the water about 20 feet in front of the fish with a loud "plunk" that sent it darting off into the depths. Whoops.
We moved on to a high lake, Taneum Lake, mostly just for the easy, scenic hike. We saw a few cutthroat trout cruising around, but it was not a good lake to flyfish from shore. I had brought my packraft, but nobody else much felt like paddling around on the lake when the wind picked up and snow started to fall. I might have fared better with a spinning rod. The fish did try to hand me one opportunity on a silver platter, but I blew it by failing to have the right setup when opportunity struck. I was rigged up with a heavily-weighted fly and sink-tip line from a deep shoreline when I walked up toward a shallower area and spotted a cruising fish. It paused behind an isolated boulder as if it were trying to give me the perfect opportunity to sneak into a good casting position, so I did. There was no time to change flies, so my heavy dragonfly nymph dropped into the water about 20 feet in front of the fish with a loud "plunk" that sent it darting off into the depths. Whoops.
Photos by Troutnut from Taneum Lake and the South Fork Manastash Creek in Washington
