. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OXYGEN TRANSPORT BY FRESHWATER FISH BLOOD 219 asmuch as the effect of pCC>2 2 mm. could not be discriminated from the effect of an indetectable pressure of CO2 for the blood of the most sensitive fish, the oxygen dissociation curves for all the species at pCC>2 0-2 mm. are considered to be in the virtual absence of COa. Oxygen dissociation curves for the blood of the four species are shown in Fig. 1. The data for the carp are taken from work published previously by Black and Irving (1937); the full data for the other t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OXYGEN TRANSPORT BY FRESHWATER FISH BLOOD 219 asmuch as the effect of pCC>2 2 mm. could not be discriminated from the effect of an indetectable pressure of CO2 for the blood of the most sensitive fish, the oxygen dissociation curves for all the species at pCC>2 0-2 mm. are considered to be in the virtual absence of COa. Oxygen dissociation curves for the blood of the four species are shown in Fig. 1. The data for the carp are taken from work published previously by Black and Irving (1937); the full data for the other three species are plotted in Fig. 2 (common sucker), Fig. 3 (catfish) and Fig. 4 (bowfin). The curves for the four species seem to constitute one family of curves rising from the origin without evidence of an inflection which may, however, be present at higher temperatures. /OOr. /O £03040 60 80 /OO p Os /n mm /SO FIG. 2. Oxygen dissociation curves for the blood of the common sucker at various pressures of CO2. (N. B. Change in scale.) The pressure of oxygen required to half saturate the blood is often taken as a characteristic of the dissociation curve. Krogh and Leitch (1919) called this the tension of unloading (/„). This point does not necessarily represent the true conditions for unloading of fish blood so that the pressure at half saturation is used in this paper merely to represent the mid-point of the functional range of the hemoglobin. Further, the pressure of half saturation may be used as a single figure to represent the oxygen affinity of the blood, when the blood is equili- brated in the virtual absence of CCV These pressures are given in Table II and reflect the fact that the curves for the catfish, bowfin and carp rise more steeply than that for the common sucker. They also indicate that, under these conditions of CO2 and temperature, the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
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