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.
“Purity (in fly fishing) by nostalgia is an interesting idea, but the logic of it is inescapable. If we carry purism to its logical conclusion, to do it right you’d have to live naked in a cave, hit your trout on the head with rocks, and eat them raw. But, so as no to violate another essential element of the fly fishing tradition, the rocks would have to be quarried in England and cost $300 each.” -John Gierach