Includes all genotypes obtained from the focal Bellbekken river as well as the adjacent Julussa river, SE Norway. In the file are included a column with the individual ID (trout), the season (fall/autumn), the year (2002-2006), the river (Bellbekken/Julussa), the age and correspondligly the year an individual is born, the station (2-25) for the Bellbekken fish, as well as all 15 microsatellite loci the individuals were genotyped for. Julussa fish were not aged. The file also includes the recaptures from Bellbekken.