On the other hand, when the conversion of the inorganic nutrients added (0.5, 1, 2, 4,
8 and 16 mg atom N l-‘) to microalgal cultures into microalga or Artemiu biomass is
considered (Table 2), a continuous increase in the ratio of nutrients added/biomass
obtained is observed. This is a result of a lower efficiency of conversion of nutrients in
the microalgal cultures with increasing nutrient concentration. Values lower than unity
are obtained in these ratios since carbon is not included in the calculations of nutrients
added to the microalgae cultures.