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 is a Pumpkinseed sunfish, Lepomis gibbosus, which I caught unexpectedly in a trout stream a year before I started this site.
This fish was collected from the Marengo River in Wisconsin on July 1st, 2003 and added to Troutnut.com by Troutnut on January 25th, 2006.