Abundance of Phytoplankton Genus as An Indicator of Fertility in the Estuary Waters of Musi River, South Sumatra (Supervisors: Dr. Rozirwan, M.Sc and Dr. Riris Aryawati, S.T., M.Si). This study discusses the fertility of the waters in the Musi River Estuary. In obtaining water fertility values, there are problems that must be faced, such as regarding the quality of the waters in the area. Water…