ABSTRACT This research was conducted from October 2021 to January 2022, in the Natural Feed Laboratory of the Brackish Water Cultivation Fisheries Center (BPBAP) Ujung Batee, Aceh. The purpose of this study was to determine whether urea has an effect and to determine the best urea concentration on the growth of Nannochloropsis sp. This study used an experimental method with one factor RAL (Co…