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Fish Physiology and Biochemistry

, Volume 15, Issue 2, pp 181–186 | Cite as

Potassium flux in juvenile striped bass (Morone saxatilis): influence of external concentrations of sodium chloride and calcium

  • John M. Grizzle
  • Keith A. Cummins
Article

Abstract

Whole-body influx and efflux of K+ were determined for 25-day-old striped bass,Morone saxatilis, in conditions that simulated harvesting fish from ponds. During the first 5h in fresh water with combined high NaCl (80 mM) and low Ca2+ (0.12 mM) concentrations, a combination that is acutely lethal to this age of striped bass, K+ influx for fish in 0.07 mM K+ was 21±1.7 (SEM) compared to 3.4±0.33 nmol g−1 h−1 for fish in water with low Na+ (0.25 mM) or high Ca2+ (2.5 mM) concentrations. Influx of K+ was inhibited during the first few hours after fish were placed in flux chambers. Potassium efflux as percentage of42K lost per hour was two-fold higher from fish in the high Na-low Ca treatment compared to fish in low concentrations of Na+ or high concentrations of Ca2+. Potassium efflux was probably much greater than influx, but exact values for efflux could not be calculated from the data available. Survival of fish in water with high Na-low Ca was not increased by addition of KCl to the water, indicating that the net loss of K+ was probably not the cause of death.

Keywords

striped bass ionic homeostasis potassium influx potassium efflux sodium chloride calcium 

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Copyright information

© Kugler Publication bv Amsterdam 1996

Authors and Affiliations

  • John M. Grizzle
    • 1
  • Keith A. Cummins
    • 2
  1. 1.Southeastern Cooperative Fish Disease Project, Department of Fisheries and Allied AquaculturesAuburn UniversityAuburnU.S.A.
  2. 2.Department of Animal and Dairy SciencesAuburn UniversityAuburnU.S.A.

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