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Sodium, net acid and ammonia fluxes in freshwater-adapted European flounder (Platichthys flesus L.). Pharmacological inhibition and effects on gill ventilation volume

Published online by Cambridge University Press:  27 February 2001

A. P. Clarke  and
W. T. W. Potts
A. P. Clarke
Affiliation:
Division of Biological Sciences, Institute of Environmental and Biological Sciences, Lancaster University, Bailrigg, Lancaster LA1 4YQ, U.K.
W. T. W. Potts
Affiliation:
Division of Biological Sciences, Institute of Environmental and Biological Sciences, Lancaster University, Bailrigg, Lancaster LA1 4YQ, U.K.
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Abstract

Net branchial sodium uptake, and net acid and ammonia excretion, together with gill ventilation volumes were measured in euryhaline European flounder Platichthys flesus, adapted to freshwater. External amiloride or acetazolamide (0.1 mmol l-1) caused significant reductions (P < 0.05) in sodium uptake and net acid excretion, while 0.05 mmol l-1 thiocyanate had no effect on any of the fluxes measured. Ethoxzolamide (0.1 mmol l-1) however, caused significant reductions in all fluxes measured and also caused a 32% reduction in the volume of water exhaled by the gills. In this study, it appears that sodium uptake and net acid excretion are indirectly linked, probably by a proton pump arrangement which is thought to be a mechanism for sodium uptake in trout gills.

Keywords

Platichthys flesusventilation volumesodium uptakenet acid excretionammonia efflux
Type
Research Article
Information
Journal of Zoology , Volume 246 , Issue 4 , December 1998 , pp. 427 - 432
Copyright
© 1998 The Zoological Society of London

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