Study on the medium effect for the growth rate of Spirulina, Arthrospira platensis in natural seawater

Spirulina, Arthrospira platensis, is the most important microalgae for the production of biomass as health food for human and animal food. In this experiment, the growth rates of A. platensis were tested at seven different media (F-2 with CaCO₃, F-2 with NaHCO₃, Z-1 with CaCO₃, Z-1 with NaHCO₃, Z-2 with NaHCO3, urea and T-super with NaHCO₃, and PES with NaHCO₃) at pH 9 to 10 and salinity 30%0. The culture was started at the optical density (OD) 0.20 and the experimental period was ended after 10 days in the laboratory room. Among the media urea and T-super with sodium bicarbonate were recorded the best. The optimum growth of A. platensis (OD 0.69) was observed in urea and T-super with sodium bicarbonate. In addition, urea and T-super with sodium bicarbonate gave rise to the maximum growth of A. platensis and then followed by Z-1 medium with NaHCO₃ and PES medium with NaHCO₃. The minimum OD 0.44 was recorded in F-2 medium by using CaCO₃. The results of present investigation revealed the potential use of seawater with some nutrients for laboratory culture of A. platensis.