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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

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.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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.

PaulRoberts's profile picture

Posts: 1776
PaulRoberts on Feb 2, 2018February 2nd, 2018, 1:39 am EST

Obviously shot out of the water. Would love to see how they distribute underwater. Seems like a great place for a trout fry to station. Which also suggests why the eggs are so often laid beneath larger substrate out in current. Trout fry and other tiny fry would be relegated to quiet currents near shorelines. Wonder how often these hatching larvae feed sculpins and dace?
Iasgair's profile picture

Posts: 148
Iasgair on Feb 5, 2018February 5th, 2018, 11:32 am EST
Looked like a sci-fi movie gone wrong, LOL.

But I see your point. I can see trout fry wanting to station in areas with these around.
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Feb 6, 2018February 6th, 2018, 4:12 pm EST
Awww, the little buggers look cute when they hatch. Cool.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Healdsburg, CA

Posts: 344
Millcreek on Feb 8, 2018February 8th, 2018, 1:45 am EST
I remember watching some rainbow fingerlings and California roach feeding in a small pool.Instead of facing into the current as was usual they were facing the bottom and picking up something there. I got curious and waded out for a couple of small rocks. Washing them off and looking at them under a microscope, I found hundreds of small baetid and caddisfly larvae about 1-2 mm.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
PaulRoberts's profile picture

Posts: 1776
PaulRoberts on Feb 8, 2018February 8th, 2018, 3:39 am EST
Neat how fish can find what's good for them. It's more varied than a lot of people probably suspect.

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