We used to go to the Boundary Waters when I was a kid, and there were spots where we could drop a bare hook in the water and catch a bluegill. It kept us boys out of trouble while my step-dad fly-fished from the back of the boat. The fish were so thick around the small islands that it seemed like you would step on them when you went wading.

I'm not a huge fish fan, but bluegill are tasty buggers.