Grant Walker, 17, of Murial Street in Morgan City, was arrested at 4:03 p.m. Saturday for simple battery. A deputy working the Mardi Gras parade in Bayou Vista observed a verbal altercation between two subjects. During the investigation, the deputy learned that the male subject, identified as Walker, had punched a female subject in the face, the report stated. Walker was taken to the parish jail and held. His bail is set at $500.