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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
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.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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
Partsman's profile picture
bancroft michigan

Posts: 321
Partsman on May 24, 2019May 24th, 2019, 11:51 am EDT
I fished the south branch of the Ausable river Tuesday, water is still high and cold, but I managed. Not much was going on in the morning, I tried the euro nymphing rig but couldn't get much going. As I worked a different stretch of stream, caddis started to emerge, and then also some hendricksons. the caddis were like snow blowing up the river, it was really cool! I could have watched that all day long, as it was I got lucky and this spot had a 6 or 7 fish rising, I got 3 decent browns on a x2 caddis. These fish were really spooky and it took a lot of cast and just watching, which was great! I have some pics but have to see how they look on line.
Mike.
Adirman
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Monticello, NY

Posts: 479
Adirman on May 24, 2019May 24th, 2019, 11:40 pm EDT
Do you know what species of caddis ?
Partsman
Partsman's profile picture
bancroft michigan

Posts: 321
Partsman on May 25, 2019May 25th, 2019, 8:33 am EDT
Adirman, no im sorry im lacking in my bug identification, im working on that though! I will try and make a effort to capture some bugs next time, I need some sort of net to carry with me as I have pretty poor luck trying to get them by hand or my hat.
Mike.
Adirman
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Monticello, NY

Posts: 479
Adirman on May 26, 2019May 26th, 2019, 12:19 am EDT
No worries , I’m better than unused to be but it’s not my forte either lol
Wiflyfisher
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Wisconsin

Posts: 622
Wiflyfisher on May 27, 2019May 27th, 2019, 12:58 am EDT
I ran into a huge caddis swarm in northern WI at the end of the Hendricksons hatching. I caught several and sent photos to a MI aquatic entomologist. It is believed to be Glossosoma spp.. Little Gray Sedge. The small female caddis had a huge green egg sack. I have the specimens in a vile to get positive ID made when I have time.

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