A comparison of gas tensions of tissue and blood in the trout and the carp (The blood values for the trout were taken from the data of Stevens & Randall (1967) and for the carp from Garey (1967). The latter data were selected when the water O, tensions were greater than 90. The tissue values were averaged from the individual values of Table 1. In the case of the trout, only those were taken which reflect water O, tension above 90.)