RESUMEN
The feasibility of the long-term (>170â¯days) culture of a dinoflagellate microalga in a raceway photobioreactor is demonstrated for the first time. Amphidinium carterae was chosen for this study as it is producer of interesting high-value compounds. Repeated semicontinuous culture provided to be a robust operational mode. Different concentration levels of the f/2 medium nutrients (i.e. f/2×1-3) were assayed. The composition f/2×3 (N:Pâ¯=â¯5), combined with a sinusoidal irradiance pattern (L/Dâ¯=â¯24:0) with a 570⯵Eâ¯m-2â¯s-1 daily mean irradiance, maximized the biomass productivity (2.5â¯gâ¯m-2â¯day-1) and production rate of the valuable carotenoid peridinin (19.4⯱â¯1.35â¯mgâ¯m-2â¯L-1 with nearly 1% of the biomass d.w.). Several carotenoids and polyunsaturated fatty acids were also present in significant percentages in the harvested biomass (EPA, 1.69⯱â¯0.31% d.w.; DHA, 3.47⯱â¯0.24% d.w.), which had an average P-molar formulate of C40.7O21.2H73.9N3.9S0.3P1.