PROBLEM TO BE SOLVED: To provide feed for animal plankton, enabling Rotatoria, Artemia or the like each used for seedling production of fish and shellfish to efficiently and stably proliferate, to provide a method for producing the feed for animal plankton, and to provide a method for culturing animal plankton. SOLUTION: This animal plankton is produced through culturing Chlorella in the presence of a fatty acid compound having carbon numbers 14-18 to obtain Chlorella in the cell of which the fatty acid compound is effectively stored. The thus obtained Chlorella is used as feed for animal plankton such as Rotatoria, or Artemia.
