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Plasma osmotic, Na+and Cl−regulation under euryhaline conditions inCyprinodon variegatuslacépède

Authors
Journal
Comparative Biochemistry and Physiology Part A Physiology
0300-9629
Publisher
Elsevier
Publication Date
Volume
86
Issue
1
Identifiers
DOI: 10.1016/0300-9629(87)90276-3

Abstract

Abstract 1. 1. Plasma osmotic, Na + and Cl − concentrations were evaluated in the teleost fish Cyprinodon variegatus Lacépède following acclimation in a series of ambient salinities from 1% sea-water (SW) to 360% SW. 2. 2. Plasma osmotic concentrations ranged from 337 ± 13 to 635 ± 39 mOsm/kg while plasma Na + ranged from 165 ± 8 to 285 ± 19 meq/l, and plasma Cl − from 129 ± 12 to 270 ± 19 meq/1 over this ambient range. 3. 3. Plasma Na + was more tightly regulated than plasma Cl −, with a Na +: Cl − ratio of 1.28 in 1% SW and 1.05 in 360% SW. 4. 4. Contributions of Na + plus Cl − to total osmotic concentration were not significantly altered over the ambient range.

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