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¹ Khulna Agricultural University, Department of Aquaculture, Khulna-9100, Bangladesh
² Bangladesh Agricultural University, Department of Aquaculture, Mymensingh 2202, Bangladesh DOI : 10.4194/AQUAST776 Viewed : 1837 - Downloaded : 1843 Microalga Chlorella vulgaris was cultured in different concentrations of normal molasses medium (NMM_{0.5 g/l}, NMM_{1.0 g/l}, and NMM1.5 g/l) to evaluate growth performance of the sugar mill byproduct as a low cost culture media and Bold basal medium (BBM) as control. Maximum growth of Chlorella vulgaris was found in NMM _{1.0 g/l} on 8th day of the culture followed by BBM, NMM _{0.5 g/l} and NMM _{1.5 g/l}. Similar findings were also observed in determining chlorophyll a content and optical density of C. vulgaris. Maximum cell growths 191.88 (Χ 10⁵)/mL, chlorophyll a content 10.60 (mg/l) and optical density 2.15 were recorded in NMM_{1.0 g/l}. Maximum SGR of cell was determined 0.56 (mg/day) grown in NMM_{1.0 g/l} followed by 0.52, 0.52 and 0.48 (mg/day) in BBM, NMM_{0.5 g/l} and NMM_{1.5 g/l}, respectively. Chlorophyll a content and total biomass of Chlorella vulgaris followed the similar trend. Protein (46.49%) and lipid (14.18%) of C. vulgaris was detected significantly higher (P<0.01) in NMM_{1.0 g/l} than that grown in BBM and other concentrations of NMM. The growth performance of the investigating molasses medium (NMM_{1.0 g/l}) indicates that the molasses may be a good low cost culture medium ingredient source for C. vulgaris or any other microalga species. Keywords : Microalga Optical density Biomass Chlorophyll a Protein