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Dunaliella is a green microalgae that produces carotenoids, one of the carotenoid types produced is β-carotene which accumulated in very high amounts in some stressful conditions such as nitrogen limitations, high salinity and exposure high light intensity. Leucaena leucocephala is one of the natural ingredients that  potential as a source of nutrition of Dunaliella sp. growth. The aim of this study was to determine the effect of different salinity in Lamtoro Leaves Extract Media on growth and carotenoid content Dunaliella sp. The research was conducted in Aquaculture Laboratory, Agriculture Faculty, Lampung University. The design of research was used completely randomized design with 4 treatments and 3 repetitions. The treatments used was Lamtoro Leaves extract media with salinity  30 ppt, 35 ppt, 40 ppt, and 45 ppt. The result showed that media of Lamtoro Leaves extract with different salinity gave significant effect on cell density and carotenoid content of Dunaliella sp. (p<0,05). The results of this study showed that the best cell growth occurred in the treatment of salinity 30 ppt with cell density reached 5,09×10 6 cells/ml, while the highest carotenoid content was produced at 35 ppt salinity treatment of 1,0668 g/ml

Effect of Different Salinityon Growthand Carotenoid Content of Dunaliella sp. In Lamtoro Leaves Extract Media (Leucaena leucocephala)