A Preliminary Study on Gas Exchange in Carp

概要

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A trial study on the gas exchange was performed in carp.Curves showing the relationship between partial pressure and CO2- or O2- volume % contained in blood were obtained. In the carp respirating water from Marriot's flash the PCO2 PO2 were determined both in Aorta and in Vena. O2 consumption was measured. Cardiac output was calculated. Results obtained under the experiment arrangement are as follows. 1. PaCO2 was about 13mmHg in 4 cases. 2. PvCO2 was 16 to 39mmHg (average 30mmHg) in 4 cases. 3. PaO2 was found to be 10 and 12mmHg in 2 cases. The small value must have resulted from the experiment arrangement. 4. PvO2 was found 2mmHg. This suggests that the tissue of carp survives at a low Po2. 5. The difference in CO2-vol % between Aorta and Vena changes according to that in O2. 6. Both PaCO2 and PvCO2 are very small in comparison with those in man . On contrary, ΔPCO2 in carp exceeds that in man. 7. At periphery the arterial blood liberates 80% of O2 contained. 8. It seems probable in carp exposed to the atmosphere that gas exchange proceeds to some extent. 9. Cardiac out put in carp was calculated to be about 13cc/min. kg.
日本魚類学会の論文