EFFECT OF PHOTOPERIOD REGIMES ON GROWTH, BIOMASS AND PIGMENT CONTENT OF NANNOCHLOROPSIS SP. BJ17M. FAKHRI, SANUDI, N.B. ARIFIN, A.W. EKAWATI, A. YUNIARTI AND A.M. HARIATIAbstract Nannochloropsis sp. is a green micro alga that has been widely applied for live feed and pigment source for aquaculture animals. The effects of different photo periods of 8:16, 12:12, 18:6 and 24:0h light:dark regimes on cell growth, biomass concentration, chlorophyll a and carotenoid values of Nannochloropsis sp. BJ17 were examined. The results exhibited that different photoperiods significantly influenced the growth, biomass production, chlorophyll a and carot enoid values of Nannochloropsis sp. BJ17. The highest maximum specific growth rate of 2.04 day-1, maximum cell concentration of 51 x 106 cells mL-1 and biomass concentration of 0.842 g L-1 were produced under 24 h light regimes. The highest chlorophyll a 12.858 μg mL-1and carot enoidof 5.138 μg mL-1 were registered under continuous illumination. We conclude that cell growth, biomass and chlorophyll a and carotenoid content of Nannochloropsis sp. BJ17 were significantly affected by photoperiod.
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