The growth of the marine flagellate Isochrysis galbana was followed in batch cultures at four concentrations of dissolved inorganic carbon (DIC), from C- and N-replete lag phase into C- and/or N-deplete stationary phase. Organic buffers were omitted from the growth medium, and culture pH was maintained at 8.30±0.05 by the addition of acid or alkali. The responses of the flagellate to N stress included an increase in the C[ratio ]N ratio, and decreases in the ratios of glutamine (Gln)[ratio ]glutamate (Glu) and Chl a[ratio ]C, and the cell Chl a quota. Conversely, the responses to C stress included a decrease in the C[ratio ]N ratio, and increases in the ratios of Gln[ratio ]Glu and Chl a[ratio ]C, and the cell Chl a quota. The relationship between carbon-specific growth rate (C-μ), and the concentration of extracellular DIC, [DIC]ext, exhibited Michaelis–Menten type kinetics with a half saturation constant, KG(DIC), of 81 μM. Comparative studies of the diatom Phaeodactylum tricornutum showed similar results, although the value of KG(DIC) was lower at 30 μM.