This research was conducted from 24 June to 6 July 2019 in the Regional Technical Implementation Unit of the Seawater and Brackish Aquaculture Fisheries Center (UPTD BPBALP Teluk Buo), West Sumatra. This study aim to determine the effect of Ammonium Sulfate ((NH4)2SO4) with different concentrations on the growth rate of Nannochloropsis oculata microalgae population. The method used in this stud…