Ive always thought it was just a common shiner. To be sure one would have to count the dorsal and anal rays, and compare to this:
Common Shiner (Notropis cornutus): These fish are one of the most common type of bait fish and are almost exclusively stream dwellers. The Common Shiner can be identified by the nine rays on its anal fin and terminal mouth. This minnow is typically bluish silver on the sides and greenish blue on the back., save for breeding season in which case the male gains a rose colored tail and anal fin. The Shiner grows about 5â€"10 cm (2â€"4 in) within one year and reach a size of 13 cm (5 in) at adulthood.