Effects of freshwater and saltwater adaptation and dietary salt on fluid compartments, blood pressure, and venous capacitance in trout

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
K R Olson, Todd M Hoagland

Abstract

Trout are of interest in defining the relationship between fluid and salt balance on cardiovascular function because they thrive in freshwater (FW; volume loading, salt depleting), saltwater (SW; volume depleting, salt loading), and FW while fed a high-salt diet (FW-HS; volume and salt loading). The effects of chronic (>2 wk) adaptation to these three protocols on blood volume (51Cr red cell space), extracellular fluid volume (99mTc-diethylene triaminepenta-acetic acid space), arterial (dorsal aortic; P(DA)) and venous (ductus Cuvier; Pven) blood pressure, mean circulatory filling pressure (zero-flow Pven), and vascular capacitance were examined in the present study on unanesthetized rainbow trout. Blood volume, extracellular fluid volume, P(DA), Pven, and mean circulatory filling pressure progressively increased in the order SW < FW < FW-HS. Vascular capacitance in SW fish appeared to be continuous with the capacitance curve of FW fish and reflect a passive volume-dependent unloading of the venous system of FW fish. Vascular capacitance curves for FW-HS fish were displaced upward and parallel to those of FW fish, indicative of an active increase in unstressed blood volume without any change in vascular compliance. These studie...Continue Reading

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Citations

Jul 29, 2011·The Journal of Experimental Biology·Keven R JohnsonKenneth R Olson
Feb 20, 2010·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·I LeguenP Prunet
Jan 12, 2010·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Carol BuckingChris M Wood
Apr 17, 2016·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Dennis Kolosov, Scott P Kelly
Dec 3, 2016·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Jeroen BrijsMichael Axelsson
Jan 30, 2009·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Keven R Johnson, Kenneth R Olson
Feb 26, 2016·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Jeroen BrijsErik Sandblom
Aug 10, 2019·The Journal of Experimental Biology·Daniel MorgenrothErik Sandblom
Dec 6, 2011·Advances in Physiology Education·Douglas Curran-Everett
Jun 24, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Steve F PerryColin Montpetit
Feb 5, 2021·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Erika SundellErik Sandblom
Sep 1, 2009·The Journal of Experimental Biology·Keven R Johnson, Kenneth R Olson
Oct 8, 2021·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Daniel MorgenrothErik Sandblom

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