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 specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
Brian314 on Jul 7, 2019July 7th, 2019, 2:54 am EDT
One summer (years ago) on the Au Sable South Branch (at Truettner's, to be exact) I kept running into these weird-but-beautiful flies - took me forver just to figure out what they were - was wondering if anyone has ever seen a trout take one ??
Falsifly on Jul 8, 2019July 8th, 2019, 2:20 am EDT
Yes I have but they were females ovipositing. The technique required would be dapping. Unfortunately they were laying their eggs under a thick very low hanging willow through which it was impossible to gain access. It was interesting to watch and I gave it some thought but had to move on.
Falsifly
When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."
Troutnut on Jul 11, 2019July 11th, 2019, 3:53 am EDT
The larvae are found more often in still water than running water, although that can include still-water sloughs connected to a river. I wouldn't be surprised if trout take a few, although I've never seen them in numbers that would make a trout selective enough to require an imitation.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Jmd123 on Jul 12, 2019July 12th, 2019, 12:38 am EDT
Their larvae like iron seeps - places where Iron-rich groundwater comes to the surface, and makes that funky orange-yellow looking flocculent stuff called "yellowboy" (an iron oxide-hydroxide mixture). Find this, dig around in it, and you will find the larvae, and probably a few adults flying around too. They're cool and pretty!
Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...