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Biomass production of the marine microalga Chroomonas sp., as a function of pH, luminic intensity, and salinity

Abstract:

We report the characterization of a marine microalga of the genus Chroomonas, isolated from a salt lagoon located to the north of Maracaibo, Zulia State, Venezuela. Wc evaluated the growth and the pigment production in discontinuous culture at different salinites (5, 10, 35, 50, 70 y 100 ppm), light intensites (39, 78, 117 and 156 umol quanta.m-2.s-1) and pll (5.0, 5.5, 6.0, 7.0, 8.0 and 9.0). The highest cellular density, 117.99±2.62xl0-6 cel.ml-1, was reached at 35ppm, 156 umol quanta.m-2.s-1 of light intensity and a pII between 6.0 and 8.0. The cellular content of total chlorophyll and carotenoids increased with the salinity up to 100 ppm, with amounts of 246.55±61.8 y 69.79±18.19 fg.cch-1, respectively. The cellular productivity 4.31xl09 ccl.-1d-1 was obtained when the microalga, was grown in semi-continuous culture, at a 2.0 1 volume and at a daily renewal rate of 30 [%] (v/v). The total amount of chlorophyll and carotenoids was 1.4 and 0.48 mg.l-1.d -1, respectively. This results indicate that this planktonic microalga could be used as daily live food for larvae in aquaculture and for the production of microalgal biomass and/or pigments.