An experimental comparison of cannibalistic response in different Arctic charr (Salvelinus alpinus (L.)) stocks


Department of Marine and Freshwater Biology, Norwegian College of Fishery Science, University of Tromsø, N-9037 Tromsø, Norway


Abstract– The cannibalistic response of four domesticated Arctic charr stocks were compared experimentally using a radiographic technique. Charr from Arctic Spitsbergen (80°N) consistently exhibited a much higher frequency of cannibalistic response than fish from three charr strains from mainland Norway (70°N). The results indicate that the extent of cannibalistic feeding in Arctic charr is population specific and support the hypothesis that charr from Arctic populations have stronger cannibalistic tendencies than do fish from more temperate regions.