Summary
Ventilatory frequency, oxygen tensions of inspired and expired water and of water entering and leaving the experimental chamber were measured for trout in hypercapnic or hyperoxic conditions. Oxygen consumption, oxygen utilisation coefficient and ventilatory flow rate were calculated from these data.
Hypercapnia (PWCO 2=5 Torr) markedly increased ventilation even after 72 h of hyperoxia while\(\dot M_{O_2 } \) remained unchanged. Thus external CO2 stimulates ventilation even when the fish is breathing hyperoxic water and bloodP CO 2 is elevated.
Hyperoxia (PWO 2=400–450 Torr) decreased ventilation but increased\(\dot M_{O_2 } \).
The changes in\(\dot M_{O_2 } \) are discussed in comparison with the changes in ventilatory activity.
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Equipe de recherche associée du Centre National de la Recherche Scientifique No. 07622
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Thomas, S., Fievet, B., Barthelemy, L. et al. Comparison of the effects of exogenous and endogenous hypercapnia on ventilation and oxygen uptake in the rainbow trout (Salmo gairdneri R.). J Comp Physiol B 151, 185–190 (1983). https://doi.org/10.1007/BF00689917
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DOI: https://doi.org/10.1007/BF00689917