Fig. 4.
Time-dependent changes are present in Hb-oxygen-binding affinity (P50
black circles) but not in oxygen content (
dark gray squares) of trout (O. mykiss). This increase in oxygen-binding affinity (decrease in P50) takes place due to reduction of erythrocyte NTP concentration, without an overall increase in oxygen content (modified from Soivio et al. 1980)