Maximum specific growth rates (µm) ± SEM of the fertilizers are given in Table 1. A rapid increase in biomass values was observed in all treatments on the second day, giving the maximum specific growth rates (µm) of 0.71 ± 0.02, 0.69 ± 0.01, and 0.59 ± 0.05 for Commercial Fertilizer II, TMRL, and Modified SOT Medium, respectively. Although the maximum specific growth rate of A. platensis cultured using Commercial Fertilizer II was higher than those cultured using TMRL and Modified SOT Medium, no significant difference (P>0.05) was found among the treatments.