魚の血液ガス含量と環境水の酸素分圧との関係

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1) The content of oxygen and carbon dioxide of both the arterial and venous blood of the carp were determined. (Fig. 1.) 2) The figure showing the relation of the oxygen content of the arterial blood to various tensions of oxygen of the breathing water is similar to the oxygen dissociation curve of the blood. On the contrary, the oxygen content of the venous blood is generally low, and does not show clear relation to the oxygen tension of the breathing water. (Fig. 3.) 3) The carbon dioxide content showed no much difference between the arterial blood and the venous. 4) The arterial blood bled from such a fish as suffering from surfacing condition (i.e. symptoms of dyspnoea) showed a very low oxygen content. The carbon dioxide content also diminished in such a case. Carp may develop surfacing when the oxygen content of the arterial blood is less than 2 vol. %, and may be sound when the value is more than 3 vol. %. (Fig. 2.)
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