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Journal of Experimental Biology, Vol 198, Issue 11 2359-2364, Copyright © 1995 by Company of Biologists

JOURNAL ARTICLES

Effect of dietary salt load on transepithelial Na+ exchange in freshwater rainbow trout (Oncorhynchus mykiss)

N Smith, F Eddy and C Talbot

Dietary Na+ loads (0.5­70 mmol kg-1 fish) were almost completely absorbed within 7 h, and branchial Na+ excretion commenced within 1 h. Na+ loads of less than 1 mmol kg-1 were lost through the gills through a significant decrease in Na+ influx with unaltered Na+ efflux rate (compared with Na+ fluxes in unfed fish). At higher salt loads (>18 mmol kg-1), Na+ loss increased as a result of significantly higher Na+ efflux rates, with no further decrease in Na+ influx rate. Tissue Na+ concentrations were unchanged, apart from a significant increase in blood plasma Na+ concentration in fish loaded above 18 mmol kg-1. The results show that branchial Na+ fluxes may be rapidly adjusted in response to prevailing conditions, and possible control mechanisms are discussed.
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This article has been cited by other articles:


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G. G. Pyle, C. N. Kamunde, D. G. McDonald, and C. M. Wood
Dietary sodium inhibits aqueous copper uptake in rainbow trout (Oncorhynchus mykiss)
J. Exp. Biol., February 1, 2003; 206(3): 609 - 618.
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© The Company of Biologists Ltd 1995