it's fat bodied, big scaled, and reflects blue like a common shiner, but 9 inches sounds a bit big for one (I thought i read they max out at 8 inches). The head shape compared to the body seems a bit odd so I am not quite sure what it is.
Mike, what made you wonder if it was not a silver chub? It's certainly a nice one. btw, that caudal fin pigmentation (dark streak on bottom lobe with a pale edge) is present in most big-river Macrhybopsis...