ABSTRACT Dunaliella salina is a microalga containing carotenoids. Carorenoids have a role in the absorption of light for photosynthesis, carotenoids also function in coloring for aquaculture animals. Carotenoids is influenced by a variety of environmental factors, such as salinity. This study aims to get the best salinity in increasing the density and carotenoid content of D. salina .The r…