This work aims to evaluate its effect on cell density, biomass, and proximal composition in semicontinuous cultures. Thalassiosira weissflogii was cultivated five culture media, for which the f medium taken as reference, concentrations of nitrates, phosphates, silicates were modified up a factor four treatments (f/4, f/2, f, 2f, 4f). Cell density biomass increased initial nutrients rose treatme...