In Halawakee Creek, the rough shiner, Notropis baileyi, showed two distinct feeding peaks, one during the daylight and the other during the hours of darkness. Immature forms of Diptera, Ephemeroptera, and terrestrial insects were dominant in the diet during the 24-hr period. These organisms were also common in the drift samples taken concurrently with the fish. Daily ration varied from 5.9 to 6.5% of the body weight. Feeding intensity was lowest in winter, highest in spring and summer and moderate in autumn. Fish less than 35 mm fork length fed on dipteran larvae, terrestrial insects and detritus throughout the year. The diet of the larger fish (> 35 mm) was dominated by terrestrial insects, ephemeropteran nymphs, trichopteran larvae and detritus. The diet of the larger fish was more diverse than that of the smaller individuals. The opportunistic feeding habits are in part responsible for the success of this introduced species in Halawakee Creek. INTRODUCTION Because of the recent introduction and subsequent establishment of the rough shiner, Notropis baileyi Suttkus and Raney, in Halawakee Creek, Alabama, the factors responsible for its unprecedented success have been under investigation since 1968. Mathur and Ramsey (1974) reported on the reproductive biology of the rough shiner and concluded that a long, successful spawning season, a short maturation period -and high fecundity were, in part, responsible for its establishment in Halawakee Creek. Since then, we have completed other studies which provide further information relevant to the ecological success of this species. In the present paper we examine the food and feeding habits and define the role of the rough shiner in the trophic dynamics of the fish community in Halawakee Creek. Halawakee Creek rises in Chambers Co., Ala., flows SE through Lee Co. and enters Lake Harding (Chattahoochee River), AlabamaGeorgia. The creek is about 29 km long and is located in the Piedmont region of E-central Alabama. The physical and chemical characteristics of the creek have been described by Hurst (1969) and Mathur (1973a). METHODS The method of determination of daily feeding periodicity was similar to that described by Mathur (1973b). It comprised the findings during two 24-hr periods of seining (17-18 April and 2-3 September 1970). The seining was carried out at 3-hr intervals over a '24-hr 1 Present address: Ichthyological Associates, P. 0. Box 12, Drumore, Pennsylvania 17518.