The purpose of this paper is to synthesize information on the energetics and food requirements of krill predators that may be in the most direct competition with the krill fishery. These krill predators are the Adélie (Pygoscelis adeliae), chinstrap (Pygoscelis antarctica), gentoo (Pygoscelis papua), and macaroni (Eudyptes chrysolophus) penguins and the crabeater (Lobodon carcinophagus) and Antarctic fur (Arctocephalus gazella) seals. Basal, active, and. reproductive energy ' requirements are compiled for each species. Estimates' of the amount of krill needed . to sustain individuals and/or breeding pairs and population requirements are provided.