Abstract
1. 1. Carp ( Cyprinus carpio) were stressed to exercise by rolling in a respiration chamber. Ventilatory water flow rate, cardiac output and blood respiratory parameters were determined. 2. 2. During exercise, oxygen uptake increased about 3.5-fold and returned to pre-exercise level within 15 min. 3. 3. This exercise-stress resulted in no plasma acidosis and in no swelling of the erythrocytes. 4. 4. Ventilatory water flow rate increased 6-fold, whereas cardiac output increased 2-fold. Hence the ventilation-perfusion ratio increased during exercise. 5. 5. During exercise, arterial O 2 content (CaO 2) increased due to increases in O 2 tension (PaO 2), O 2 saturation of hemoglobin ( SaO 2) and hemoglobin concentration (Hb). On the other hand, Pv̄O 2 and Sv̄O 2 remained at the resting levels but Cv̄O 2 slightly increased due to an increase in Hb. 6. 6. Arterial-venous O 2 difference (CaO 2- Cv̄O 2) increased by 38%, which was met by a much greater increase in CaO 2 than Cv̄O 2.
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