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The effect of exogenous catecholamines on the ventilatory and cardiac responses of normoxic and hyperoxic rainbow trout, Oncorhynchus mykiss

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Abstract

Ventilation frequency, opercular pressure amplitude, heart rate, dorsal aortic pressure, arterial pH, arterial O2 tension, and plasma catecholamine levels were recorded in rainbow trout, Oncorhynchus mykiss, during normoxia (19.7 kPa, 148 mmHg) or hyperoxia (51.2 kPa, 384 mmHg) after injection of various concentrations of catecholamines. In normoxic fish, adrenaline injection resulted in a depression of arterial O2 tension, hypoventilation due to a drop in ventilation frequency, and a drop in heart rate, while dorsal aortic pressure increased. Noradrenaline depressed ventilation frequency, but opercular pressure amplitude increased to a far greater extent, and dorsal aortic pressure increased. During hyperoxia, adrenaline injection lowered ventilation frequency, opercular amplitude and heart rate, but dorsal aortic pressure increased. The stimulatory effects of noradrenaline on ventilation were abolished during hyperoxia, but the cardiac responses were similar to those seen during normoxia. These results indicate that catecholamines can modify the ventilatory output from the respiratory centre, and modification of ventilation frequency can occur independently of opercular pressure amplitude.

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Abbreviations

f g :

ventilation frequency

HPLC:

high performance liquid chromatography

P op :

opercular pressure amplitude

f h :

heart rate

P DA :

dorsal aortic pressure

pHa :

arterial pH

P aO2 :

arterial oxygen tension

PO2 :

oxygen tension

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Authors and Affiliations

  1. Department of Zoology, University of British Columbia, 6270 University Blvd., V6T 1Z4, Vancouver, British Columbia, Canada

    S. Aota & D. J. Randall

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  1. S. Aota
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  2. D. J. Randall
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Aota, S., Randall, D.J. The effect of exogenous catecholamines on the ventilatory and cardiac responses of normoxic and hyperoxic rainbow trout, Oncorhynchus mykiss . J Comp Physiol B 163, 138–146 (1993). https://doi.org/10.1007/BF00263599

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