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.
These three Isonychia nymphs show the variety within the species from a single day at a single collection site.
This mayfly was collected from the Namekagon River in Wisconsin on January 14th, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.