In earlier posts, I referred to this fish as a bluegill.
I was just looking at it though, and I thought to myself, "that doesn't look like a bluegill." All those species in the Sunfish family are kind of the same looking. Sunfish back in Michigan have bright yellow bellies, but maybe this is a species we don't have in Michigan. I've checked my Field Guide to North American Fishes, but nothing really looks all that similar. I caught it in the Menomonee River on a bead head scud. I'm sure it belongs to the genus Lepomis, but I can't figure out the species.