The effects of adding phosphate with a concentration between 5 and 45 mg L1 to the enriched seawater
medium showed that the growth of Thalassiosira sp. increased
gradually with a lag phase of 2 d followed by the exponential
phase. At the beginning of the stationary phase (8th day), cell
growth reached maximum cell density at a range of 7.3–
8.3 106 cell mL1 (Fig. 1B). The value of F test among tested medium
cultures was 0.18 (less than the critical value of F at the 99%
confidence level of 2.34), indicating no significant difference in biomass
production obtained from different phosphate concentrations
in the culture medium.