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Journal of Experimental Biology 127,349-354 (1987)
Published by Company of Biologists 1987

The Effects of Reduced Gill Area and Hyperoxia on the Oxygen Consumption and Swimming Speed of Rainbow Trout

GARRY G. DUTHIE 1 and GEORGE M. HUGHES 2

1 Research Unit of Comparative Animal Respiration, University of Bristol, Woodland Road, Bristol BS8 1UG; Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen, AB2 9SB, Scotland
2 Research Unit of Comparative Animal Respiration, University of Bristol, Woodland Road, Bristol BS8 1UG

Rainbow trout with a cautery-induced 30% reduction in functional gill area showed significant proportional reductions in maximum oxygen consumption (Voo2max) in comparison to controls, but oxygen consumption at rest and at subcritical swimming speeds was not affected. This corroborates suggestions that total gill area is utilized for oxygen uptake only under conditions of maximum aerobic demand. During swimming trials, hyperoxia (POO2 300mmHg) neither increased VOO2max of control fish nor compensated for the reduced VOO2max apparent in fish with reduced gill area. Therefore a direct limitation on oxygen uptake at the gills is implied.

Key words: trout, reduced gill area, hyperoxia, swimming performance

Accepted on July 29, 1986




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© The Company of Biologists Ltd 1987