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Journal of Experimental Biology 141,407-418 (1989)
Published by Company of Biologists 1989

Acid-Base Regulation Following Exhaustive Exercise: A Comparison Between Freshwaterand Sea Water-Adapted Rainbow Trout (Salmo Gairdneri)

Y. TANG ¹, D. G. McDONALD ², and R. G. BOUTILIER ¹

¹ Department of Biology, Aquatron Laboratory, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 4J1
² Department of Biology, Aquatron Laboratory, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 4J1; Department of Biology, McMaster Univeristy, 1280 Main St West, Hamilton, Ontario, Canada L8S 4K7

Blood acid-base regulation following exhaustive exercise was investigated in freshwater- (FW) and seawater- (SW) adapted rainbow trout (Salmo gairdneri) of the same genetic stock. Following exhaustive exercise at 10°C, both FW and SW trout displayed a mixed respiratory and metabolic blood acidosis. However, in FW trout the acidosis was about double that of SW trout and arterial blood pH took twice as long to correct. These SW/FW differences were related to the relative amounts of net H⁺ equivalent excretion to the environmental water, SW trout excreting five times as much as FW trout. The greater H⁺ equivalent excretion in SW trout may be secondary to changes in the gills that accompany the adaptation from FW to SW. It may also be related to the higher concentrations of HCO₃^- as well as other exchangeable counter-ions (Na⁺ and Cl^-) in the external medium in SW compared to FW.

Key words: acid-base regulation, exercise, rainbow trout, net H⁺ equivalent excretion, sea water, fresh water

Accepted on July 13, 1988

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