Food habits of young and yearling white bass, Morone chrysops, were determined on the basis of seven sets of samples taken at approximate 2-hr intervals from sunset to sunrise in midsummer and early autumn of 1966 and 1967. Digestion rate studies were carried out in situ and in the laboratory. In most cases young and yearling fish evacuated a major share of their stomach contents within 7 to 8 hr after termination of feeding. Laboratory and field data suggest that the major feeding activity of both age groups occurred prior to sunset; young fish apparently ceased feeding at 2 to 3 hr post-sunset while yearlings continued to feed at low levels throughout the night. Both age groups fed heavily on Daphnia spp. and Leptodora kindtii, but yearlings also showed heavy dependence on macroinvertebrates (Amphipoda, Diptera and Odonata) and fish (principally Centrarchidae and Cyprinidae) in later post-sunset hours.