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.
Caught my first fish at 6. (a rainbow trout) Started tying at 8 & been at it for 50+ years. Love rivers. One of the founders of Washington Trout. (Now: The Wild Fish Conservancy)