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Journal of Experimental Biology, Vol 128, Issue 1 255-267, Copyright © 1987 by Company of Biologists

JOURNAL ARTICLES

The effects of prolonged epinephrine infusion on the physiology of the rainbow trout, Salmo gairdneri. II. Branchial solute fluxes

MG Vermette and SF Perry

Rainbow trout were infused continuously for 24 h with epinephrine in order to elevate circulating levels to those measured during periods of acute extracellular acidosis (about 5 X 10(-8) mol l-1). Concomitant effects on branchial solute fluxes were evaluated. Epinephrine infusion caused complex and differential adjustments of Na+ and Cl- unidirectional fluxes (influx and efflux) resulting in a significant elevation of the arithmetic difference between Na+ and Cl- net fluxes (JnetNa+-JnetCl-). A significant correlation existed between JnetNa+-JnetCl- and net branchial acid excretion (JnetH+), thereby suggesting a role for epinephrine in piscine acid-base regulation. The stimulation of JnetH+ by epinephrine was due primarily to a reduction in the excretion of titratable acid (JTA) accompanied by non-significant changes in ammonia excretion (JAmm). The results are discussed with respect to a role for epinephrine in regulating acid-base disturbances by interacting with branchial ionic exchange mechanisms.


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 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
C. Bucking and C. M. Wood
Gastrointestinal processing of Na+, Cl-, and K+ during digestion: implications for homeostatic balance in freshwater rainbow trout
Am J Physiol Regulatory Integrative Comp Physiol, December 1, 2006; 291(6): R1764 - R1772.
[Abstract] [Full Text] [PDF]


© The Company of Biologists Ltd 1987