It is a Golden Shiner (aka Roach), as has been mentioned.

Forty years ago I used them for bait for largemouth fishing at the fabled Lake Jackson in Tallahassee, FL. We caught them using a cane pole with #16 hook baited with bread dough. To bring them in we anchored up inpockets of lily pads, chummed with stale bread, and beat the water with the cane poles to simulate, I imagine, the sound of fish feeding actively. At the time they were sold at the bait camps for 50 cents each--a dear price. Being a poor student, I found it necessary to catch my own.

BTW, they are perhaps the single best bait for largemouth.