ABSTRACT Density of Spirulina sp. can be influenced by nutritional and environmental factors. Nutrient factors have an important role in the process of photosynthesis. This study aims to obtain the best dose of coconut water on the density of Spirulina sp. This research was conducted on May 20, 2022 to June 28, 2022, at the Aquaculture Environmental Quality Laboratory (MLB) Faculty of Fisherie…