We investigated the variations and the interrelationships among heart rate, blood pressure, ventilation frequency, blood gases, electrolytes, and catecholamine concentrations in the common carp Cyprinus carpio under resting conditions. The mean catecholamine values of blood parameters and cardiovascular-respiratory properties were not significantly different between males and females. No significant sexual differences in correlation coeffi cients were observed. Therefore, the sexual difference hardly affected these properties of the common carp, which had immature gonad, under resting conditions. Blood Na^+ and Cl^- concentrations and pH of the common carp were strictly controlled under resting conditions since the coefficient variations of Na^+, Cl^- and pH were much lower than those of the other properties. Some blood properties of the resting carp were found to correlate with each other: heart rate, dorsal aortic blood pressure, ventilation frequency, blood pH, O_2 partial pressure, and catecholamine concentrations. The variations in blood pH, O_2 partial pressure, and catecholamines of the resting carp little effect on the heart rate and the blood pressure.
Cyprinus carpio
resting condition
blood gas and electrolyte
catecholamine
heart rate
blood pressure