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A method for oxygenating and mixing suspensions of turbot Psetta maxima red blood cells (RBC) was tested in 31P nuclear magnetic resonance (NMR) spectroscopy. In normoxia, the levels of inorganic phosphate (Pi) and nucleoside triphosphates (NTP) were stable up to 140 min and intracellular pH (pHi) was maintained and decreased oxygen partial pressure ( PO 2) from 30 to 15 and 600 Pa produced a significant fall in the intensity of NTP resonance, balanced by an increase in the Pi signal. Treatment of RBC with 0· 5 M isoproterenol during hypoxia exposure did not affect the pattern of changes in NTP or pHi induced by hypoxia and the effect was manifest only on Pi levels. [ABSTRACT FROM AUTHOR]