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Journal of comparative physiology

, Volume 87, Issue 1, pp 29–48 | Cite as

Gill potentials and sodium fluxes in the flounderPlatichthys flesus

  • W. T. W. Potts
  • F. B. Eddy
Article

Summary

A simple method is described of measuring the potentialin vivo between the blood plasma and external medium of a fish. The potential in the euryhaline flounderPlatichthys flesus averages +19 mV in sea water and −78 mV immediately after transfer to fresh water. The potential is largely dependent on the external concentration of sodium and behaves as a diffusion potential. The relative permeabilities of the gill of the sea water adapted flounder to Na, K. and Cl ions are in the ratio 1∶2.5∶0.03. The permeability to the divalent ions, Ca, Mg and SO4 is very low. The changes of potential account for the apparent “sodium exchange diffusion effect” observed in the sodium fluxes following changes in the external medium and the slight dependence of sodium efflux on the external concentration of potassium in sea water.

Keywords

Sodium Potassium Permeability Fresh Water Blood Plasma 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1973

Authors and Affiliations

  • W. T. W. Potts
    • 1
  • F. B. Eddy
    • 1
  1. 1.Department of Biological SciencesUniversity of LancasterBailrigg

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