The Northern Chilean scallop Argopecten purpuratus (Lamarck, 1819) has a high commercial value and aquaculture is the main source of production of this species in Chile.Larvae are generally produced in closed aquaculture systems (CAS) and early-juveniles are transferred to the sea for further grow-out.Currently a new method for mass production is relying in a technology named recirculation aquaculture systems (RAS), which significantly reduces water usage.In RAS systems water is lost by evaporation, which increases salinity in marine RAS.Variations in salinity and temperature may change rearing water quality parameters and affect physiological processes.In order to determine the feeding behavior of A.purpuratus reared under hypersaline conditions, we acclimated and static cultured 20 hatchery-produced juvenile scallops (mean shell height =26.5 mm; SD =1.9) at salinities of 34, 38, and 42 g/L, at 16℃ and 22℃.