I noticed that too but since the mouth size has people leaning to other kinds of chubs I thought I would toss it out there, Hornyheads do have a larger mouth and a female chub will be duller in color than a male.
Do we have a chub expert in the house? I know it's NOT me. I still think it is a creek chub, just my opinion of course.
Here is a female creek chub.
http://www.dnr.state.oh.us/Home/species_a_to_z/SpeciesGuideIndex/creekchub/tabid/6599/Default.aspx 
