In this study, the heritabilities for growth and cardiorespiratory organ traits in Arctic charr (Salvelinus alpinus L.), at slaughtering size, were estimated. A sample of 1325 offspring of 19 sires and 35 dams, from two strains (580 residential and 745 anadromous fish) and cultured under three temperatures (479, 428 and 418 fish at 5ºC, 10ºC and 15ºC, respectively), were analyzed for growth and anatomical characters. An animal model was applied on data base using tank/temperature, sex, maturation and strain as fixed factors. The estimates of heritabilities were 0.54±0.07, 0.45±0.07, 0.36±0.06, 0.31±0.05, for weight at days 342, 458, 591 and 695 respectively. Also for these ages, the estimates of heritabilities for length were 0.56±0.08, 0.41±0.06, 0.36±0.06, 0.31±0.06, respectively. Concerning to the weight of anatomical characters, corrected with slaughtering weight (day 695), 0.30±0.03 for gill and 0.20±0.03 for heart were estimated. All these estimations reported an important additive genetic component in Salvelinus alpinus.