Capelin (Mallotus villosus) is a pelagic fish species with large interannual stock variations in the Barents Sea ecosystem. Together with polar cod (Boreogadus saida) and juvenile herring (Clupea harengus), it functions as an intermediate link that transfers energy from zooplankton to higher trophic levels. Capelin is a key prey and important as a food resource both to sea birds, sea mammals and ...