First stage screening of lipid content in the cell was use the fluorescence staining detection by lipophilic nile red dye performance. Nile red is almost non-fluorescent in water but becomes intensely fluorescent, with a strong red emission when in a lipid-rich environment although the fluorescence emission is environmentally sensitive. Intracellular fat vacuoles, filled with neutral lipids such as cholesterol, lipoproteins and triglycerides will fluoresce green while polar lipids, such as phospholipids, will fluoresce red. All of candidate isolates were subjected to nile red dye at rate of 1 mL microalgae culture added with 10 μL of Nile Red in Acetone (500 μg/ml), thereafter was mixed by vortex for 1 min. Settling and incubation was done for 10 min. Observation was done under fluorescence microscope (Olympus, BX53). The larger appearance of red bright color was selected for further research, following Greenspan et al. method [15].