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Journal of Experimental Biology 155,165-174 (1991)
Published by Company of Biologists 1991

An Examination of Central Chemosensitivity in an Air-Breathing Fish (Amia Calva)

M. S. HEDRICK 1, M. L. BURLESON 1, D. R. JONES 1, and W. K. MILSOM 1

1 Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, Canada, V6T 2A9

The role of central chemosensitivity in the control of ventilation in fishes was investigated directly by perfusing a mock extradural fluid (EDF) through the cranial space in the medullary region of conscious air-breathing fish, Amia calva. Perfusions with Sudan Black dye showed that the mock EDF communicated with the cerebrospinal fluid (CSF) and entered the cerebral ventricles. Altering the PO2, PCO2 and/or pH of the mock EDF had no effect on gill- or air-breathing rates, heart rate or blood pressure during exposure to normoxic water. Aquatic hypoxia, however, stimulated gill ventilation and elevated blood pressure, but did not affect heart rate; altering the gas tensions and/or pH of mock EDF still had no effect on recorded variables. Sodium cyanide (NaCN) added to the mock EDF caused struggling at concentrations above 500 µgml-1, but did not uniformly stimulate ventilation. These results suggest that central chemoreceptors, which mediate cardiovascular or ventilatory reflexes, are absent in Amia.

Key words: Amia calva, fish, hypoxia, hypercapnia, chemoreceptors, ventilation

Accepted on July 12, 1990




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© The Company of Biologists Ltd 1991