This research was conducted from October to December 2018 in the Technical Services Unit (UPT) Pool and Hatchery, Faculty of Fisheries and Marine Affairs, Riau University, Pekanbaru. The purpose of this study was to determine the frequency of addition of molasses in the biofloc system to the growth and survival of red tilapia (Oreochromis sp). The method used in this study is the experimental m…