| Does the presence of a seawater gill morphology induced by dietary salt loading affect Cl(-) uptake and acid-base regulation in freshwater rainbow trout Oncorhynchus mykiss. | |
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MedLine Citation:
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PMID: 22268431 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The goal of this study was to determine the effect of the changes in gill morphology induced by dietary salt feeding on several aspects of gill function in rainbow trout Oncorhynchus mykiss maintained in fresh water with specific emphasis on Cl(-) uptake (J(IN) Cl(-) ) and acid-base regulation. The addition of 11% NaCl to the diet caused J(IN) Cl(-) to be reduced by c. 45% from 214·4 ± 26·7 to 117·3 ± 17·4 µmol kg(-1) h(-1) (mean ±s.e.). Rates of Cl(-) efflux (J(OUT) Cl(-) ), net Cl(-) flux (J(NET) Cl(-) ), J(NET) Na(+) and plasma levels of Na(+) or Cl(-) were unaffected by salt feeding. On the basis of significant effect of the salt diet on decreasing the maximal uptake rate of Cl(-) (J(MAX) Cl(-) ), it would appear that internal salt loading caused a decrease in the number of functional ion transport proteins involved in Cl(-) uptake (e.g. Cl(-) -HCO(3) (-) exchangers) and decreased the transporting capacity of existing proteins. The acid-base regulating capacity of control fish and salt-loaded fish was assessed by monitoring arterial blood acid-base status [partial pressure of CO(2) (PCO(2) ), pH and HCO(3) (-) ] during exposure to external hypercapnia (nominally 7·5 mm Hg). Both groups of fish exhibited typical compensatory responses to sustained hypercapnia consisting of the gradual accumulation of plasma HCO(3) (-) and thus metabolic restoration within 24 h of the initial respiratory acidosis elicited by hypercapnia. Overall, the results demonstrate that while Cl(-) uptake capacity is reduced in salt-fed fish, there is no associated alteration in acid-base regulating capability. |
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Authors:
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S F Perry; L Rivero-Lopez |
Publication Detail:
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Type: Journal Article Date: 2012-01-05 |
Journal Detail:
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Title: Journal of fish biology Volume: 80 ISSN: 1095-8649 ISO Abbreviation: J. Fish Biol. Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-01-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0214055 Medline TA: J Fish Biol Country: England |
Other Details:
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Languages: eng Pagination: 301-11 Citation Subset: IM |
Copyright Information:
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© 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles. |
Affiliation:
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Department of Biology, University of Ottawa, 30 Marie Curie, Ottawa, ON, K1N 6N5 Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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