A feed which uses krill as all or part of a protein source of the feed, in which shell-removed krill are used as the krill. Fluorine content is reduced to 250 mg/kg dry weight or less by the removal of shells is preferable. A method for minimizing decrease of growth rate of fishes caused by the use of krill as raw material of a feed, in which shell-removed krill are used as a protein source of a feed for fish culture.