Stomach contents were analyzed for 420 specimens of wild brook trout (Salvelinus fontinalis) from the Pigeon River, Otsego County, Michigan. All fish were caught by anglers and checked by trained personnel from April 26 to September 14, 1952. Data on coefficient of condition and volume of stomach contents were averaged by 2-week periods. Both condition and volume of stomach contents were highest in May and June and decreased thereafter during the angling season. The data suggested a close relationship among periodicity of growth, condition, and mean volume of stomach contents.