Tilapia andersoni, T. macrochir and T. rendalli account for a large portion of the 6,000-metric-ton fish catch taken each year from the Kafue floodplain in Zambia. The Kafue Gorge Hydroelectric dam, completed in late 1970, altered the natural flooding regime on much of the floodplain. From April 1969 to August 1970, I studied these species of Tilapia in a sector of the Kafue floodplain as one means of predicting the effects of the Kafue Gorge dam. I determined ages of these Tilapia species from scale samples and calculated growth of each fish during preceding years. The growth of Tilapia varied significantly from year to year. The extent of seasonal flooding correlated positively with growth of younger Tilapia of all three species.