Juvenile Antarctic krill (Euphausia superba) were fed Phaenodactylum tricornutum, at concentrations ranging from 0.0–5.0 mgC 1^–1. Intermoult period (IP) decreased, but an increment of body length per moult (∆BL) of juvenile krill increased, up to a concentration of 1.0 mgC 1^–1. No further effect of food concentrations on IP or (∆BL was seen at concentration beyond 1.0 mgC 1^–1. IP plateaued at 23.8 days and (∆BL, 1.14mm. From these results, maximum daily growth rate (∆BL /IP) of juvenile krill was calculated to be 0.047 mm day^–1, which is too slow to support the hypothesised 2-year life-span of this animal in the field. Growth conditions of krill in the Southern Ocean are discussed, with special reference to the available food concentration.

Note: The full text of this paper will be published under the above title in Polar Biology (1987)