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.
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
Former stream trout fisher for many years. Now fish only by boat. I have first hand experience with the sorry practice of stocking trout in a stream containing wild trout. The hatchery fish never survive and after a month are as skinny as snakes (the ones that are still alive).
Never release a hatchery trout, always kill and eat it.
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My favorite trout stream picture; below, shows what a first class trout river looks like. The lack of stream gradient means that this river is not subject to the roaring scouring floods so common here in PA. that wipe out everything in the river.