This study compared the growth and biomass production ofIsochrysis galbanaunder hetero-, mixo-, and phototrophic conditions using different organic carbon sources. The growth ofI. galbanawas inhibited in heterotrophy but was enhanced in mixotrophy compared to that in phototrophy. Subsequently, the influences of organic carbon and environmental factors (light and salinity) on the growth ofI. galbanawere further investigated. Algal dry weight increased as glycerol concentrations increased from 0 to 200 mmol and the highest algal production occurred at 50 mmol glycerol. At a range of light intensities of 25–200 μmol photons m−2s−2, the highest algal growth rate occurred at 100 photonsμmol m−2s−2. The growth ofI. galbanawas significantly affected by photoperiod, and the maximal dry weight was obtained at 12 h light and 12 h dark. In the salinity test,I. galbanacould grow in a wide range of salinities from 10 to 65‰, but the 35‰ salinity was optimal. This study suggests that the growth and production ofI. galbanacan be improved using mixotrophic culture at 50 mmol glycerol in 35‰ salinity.
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