A successful management of fisheries in complex and variable floodplain ecosystems, such as in the Caprivi Region in Namibia, depends on a good understanding of the fish migrations and habitat preferences. Studies of the movements and habitat utilisation of radio tagged fish in the Upper Zambezi River were, therefore, initiated by the Namibian Ministry of Fisheries and Marine Resources in 1999. As part of this programme, nine threespot tilapia (Oreochromis andersonii Castelnau, 1861) were radio tagged in the Zambezi River in Caprivi during 11-15 November 2000. The objectives of the study were to: 1) record movements and habitat utilisation of threespot tilapia, and 2) outline the implications of fish movements and habitat utilization for fisheries management. Three fish disappeared shortly after tagging and were, therefore, excluded from further analyses. The six remaining fish were tracked on average every 4.4 day during 23 November-8 May. Mean total distance moved by individual fish during the study was 13,513 m (range 2,612-44,578 m). Mean distance moved between tracking surveys was 391 m (range = 64-991 m). The fish were not stationary within a small area, but utilised a relatively large river stretch (on average 5,423 m, range = 730-15,360 m). Although to some extent moving around, the fish stayed in defined home ranges, which can be characterised as medium sized (50% probability of localisation within an average area of 48,244 m² and 95% probability of localisation within an average area of 304,645 m²). The threespot tilapia utilised to an increasing extent temporary water covered areas during rising and high water.