During 6 November - 24 December 2000, 23 tigerfish (Hydrocynus vittatus Castelnau, 1861) (30-54 cm) were tagged with radio transmitters in the Zambezi River in Namibia. The main objectives were to record movements and habitat utilisation for management purposes. The fish were tracked on average every 4.1 day during 23 November-18 May, and individuals were tracked up to 46 times. Mean total distance moved by individual fish was 26,492 m (range 547-105,988 m). Average distance moved between tracking surveys was 1,447 m (range 17-7,210 m). Two different movement patterns could be described, even though all the fish showed some sort of site fidelity. Approximately half of the fish showed only movements less than 1,000 m between tracking surveys, staying within defined home ranges. The remaining fish showed site fidelity for periods, with long distance movements (> 1,000 m) to new areas between the residency periods. The movements longer than 1,000 m were on average 18,784 m, and 42% were downstream and 58% upstream. Differences in movement patterns among individuals could not be explained by differences in body size, and there seemed to be no seasonality in the long distance movements. It is, therefore, suggested that these movements were not related to spawning, but that they, for example, were related to feeding opportunities. Keywords: Hydrocynus vittatus, tigerfish, radio telemetry, movement, habitat, behaviour, management.