This research was conducted on March 18th-May 1st, 2019 in the Laboratory of Aquaculture Technology, Faculty of Fisheries and Marine, University of Riau. The aim of this study is to determine the effect of the best dose of vitamin C addition of feed on the growth of giant prawns. The container of this research used a 60x40x40 cm 3 aquarium with 20 aquariums with a stocking density of 15 prawns/…