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Journal of Experimental Biology 149,149-160 (1990)
Published by Company of Biologists 1990

THE EFFECT OF VARYING WATER pH ON THE ACIDIFICATION OF EXPIRED WATER IN RAINBOW TROUT

HONG LIN 1 and D. J. RANDALL 1

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

Acidification of expired water was studied in rainbow trout exposed to water of pH9.91, 6.80 (control) and 3.88. For the high-pH and the control exposures, the water flowing over the gills was acidified because of the dominant effect of CO2 hydration. During the low-pH treatment, the water was alkalized because of ammonium ion formation and perhaps bicarbonate dehydration. Carbon dioxide excretion was not significantly affected by the high-pH and low-pH treatments but ammonia accumulated in the plasma in both cases.

Key words: inspiration, expiration, pH, carbon dioxide, ammonia, acidification, rainbow trout

Accepted on September 19, 1989


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© The Company of Biologists Ltd 1990