ABSTRACT The study was conducted in March 2023 at four stations: Station 1 (PAB), Station 2 (Muara Sungai Mesjid), Station 3 (Bangsal Aceh), and Station 4 (Pantai Koneng). The aim of the study was to analyze the levels of nitrate, phosphate, and silicate, identify species and abundance of epipelagic diatoms, and evaluate the relationship between nitrate, phosphate, and silicate levels and epip…