Diet composition of the shrimp Artemesia longinaris Bate, 1888 from Engaño Bay, Chubut, Argentina is described. Stomach contents of 392 prawns caught in July and October of 1999 and January and April
2000 were analysed. Results show a strong tendency towards predation, rather than a passive ingestion of detritus. Crustaceans, polychaetes, vegetable matter and diatoms are the main components of the diet. No differences were observed regarding sex, size and seasons, or the sustrata.