Abstract
Microalgae are autotrophic organisms that are very abundant in waters. The purpose of this study was to isolate marine microalgae found in Kedonganan Beach, Badung, Bali. In this study, microalgae were isolated by taking phytoplankton samples vertically with a depth of 50 cm at the study site, filtering using a plankton net. The obtained microalgae were observed under a microscope and identified. The results showed that several genera were isolated, namely Nitzschia, Botryococcus, Nannochloropsis, Ceratium, Caetoceros, Skeletonema, Closterium, and Cyclotella. Based on research, Nannochloropsis is a stable genus with a high growth rate. The results of the proximate analysis of biomass showed that the microalgae Nannochloropsis sp. contained 40.30±0.37% carbohydrates, 39.07±0.08% protein, 12.44±0.14% fat, 4.77±0.79% ash and water 3.41±0.37%. Nannochloropsis sp. microalgae isolated from Kedonganan Beach has the potential as a source of protein.
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