In 2007 samples taken from carps (Cyprinus carpio L.) aged between one and two years with an average weight of 430 g were tested for selenium concentration. The fish was obtained from a 5 ha pond owned by the MILICZ Fish Breeding Farm, located in the Barycz River catchment. The following organs were taken from each 15 fishes: muscles, trunk kidneys, hepatopancrea, gills, intestine and spleen. Selenium concentrations were determined using the hydride vapour generation method. The highest selenium content was found in spleen (on average 0.848 mg Se . kg(-1)), intestine (on average 0.651 mg Se . kg(-1)) and kidney (on average 0.603 mg Se . kg(-1)). The medium concentration, at 0.37 mg Se . kg(-1), was measured in hepatopancrea. Selenium was at its lowest concentration in gills and muscles.