Striped bass (Morone saxatilis) and Morone hybrids were studied in the Tallapoosa River downstream of Thurlow Dam from March through November 1980. Age and growth analysis revealed that over 80% of the striped bass scales had numerous false annuli, while none were observed on Morone hybrid scales. The presence of false annuli indicated interruptions in normal growth during the mid- to late-summer period. These interruptions were attributed to striped bass preferential selection of cooler water temperatures in mid-summer. The striped bass are believed to spatially separate themselves from much of their food, resulting in a reduced growth rate until water temperatures subside in the fall.