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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
Author(s) -
Clarke A. P.,
Potts W. T. W.
Publication year - 1998
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1998.tb00174.x
Subject(s) - gill , platichthys , biology , excretion , acetazolamide , sodium , medicine , zoology , euryhaline , endocrinology , chemistry , flounder , salinity , ecology , fish <actinopterygii> , fishery , physiology , organic chemistry
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.