Title
Branchial and renal ion fluxes and transepithelial electrical potential differences in rainbow-trout, **Oncorhynchus mykiss** : effects of aluminum at low pH Branchial and renal ion fluxes and transepithelial electrical potential differences in rainbow-trout, **Oncorhynchus mykiss** : effects of aluminum at low pH
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
The Hague ,
Subject
Chemistry
Biology
Source (journal)
Environmental biology of fishes. - The Hague
Volume/pages
34(1992) :2 , p. 197-206
ISSN
0378-1909
ISI
A1992JB64300010
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Adult rainbow trout, Oncorhynchus mykiss, were acutely exposed for 4 hours to low pH (4.4) and elevated Al-concentrations (300-mu-g l-1) in soft water (Ca2+ + Mg2+ = 25-mu-mol l-1). Comparison of branchial and renal ion fluxes (Na+, Cl-, Mg2+, C2+ and NH4+) gave evidence that pH and Al effects were primarily localized at the gill site. The negative whole body ion balance seemed to be caused by stimulatory effects on Na and Cl efflux especially under Al stress and to a lesser extent by inhibition of influx. Measurements of gill potentials indicated positive shifts, which were similar in response to increasing levels of H+ ions and Al. It is suggested that Al-induced changes of branchial potentials causes high diffusable loss of ions through interference with membrane-bound Ca2+ at the gill site.
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