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


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.


Sodium Potassium Permeability Fresh Water Blood Plasma 
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  1. Croghan, P. C.: The osmotic and ionic regulation ofArtemia salina (L). J. exp. Biol.35, 219–233 (1958a)Google Scholar
  2. Croghan, P. C.: The mechanism of the osmotic and ionic regulation inArtemia salina (L.). The physiology of the branchiae. J. exp. Biol.35, 224–242 (1958b)Google Scholar
  3. Croghan, P. C.: The mechanism of osmotic and ionic regulation inArtemia salina (L.). The physiology of the gut. J. exp. Biol.35, 243–249 (1958c)Google Scholar
  4. Croghan, P. C.: Ionic fluxes inArtemia salina (L.). J. exp. Biol.35, 425–436 (1958d)Google Scholar
  5. Goldman, D. E.: Potential, impedance and rectification in membranes. J. gen. Physiol.27, 37–60 (1943)Google Scholar
  6. Hodgkin, A. L., Horowicz, P.: The influence of potassium and chloride ions on the membrane potential of single muscle fibres. J. Physiol. (Lond.)148, 127–60 (1959)Google Scholar
  7. Hoar, W. S., Randall, D. J. (eds.): Fish physiology, vol. I. New York-London: Academic Press 1969Google Scholar
  8. Keys, A. B.: Chloride and water secretion and absorption by the gills of the eel. Z. vergl. Physiol.15, 364–388 (1931)Google Scholar
  9. Kerstetter, T. H., Kischner, L. B., Rafuse, D. D.: On the mechanism of sodium ion transport of irrigated gills of the rainbow trout (Salmo gairdneri). J. gen. Physiol.56, 342–359 (1970)Google Scholar
  10. Krogh, A.: Osmotic regulation in fresh water fishes by the active absorption of chloride ions. Z. vergl. Physiol.24, 656–666 (1937)Google Scholar
  11. Maetz, J.: Evidence for a sodium potassium exchange in the branchial soldium-excreting pump. Science166, 613–615 (1969)Google Scholar
  12. Maetz, J.: Fish gills in mechanisms of salt transfer in fresh water and sea water. Phil. Trans. B262, 209–249 (1971)Google Scholar
  13. Maetz, J., Campanini, G.: Potentials tranépithéliaux de la branchie d'Anguillein vivo en eau douce et eau de mer. J. Physiol. (Paris)58, 248 (1966)Google Scholar
  14. Motais, Garcia Romeu, F., Maetz, J.: Exchange diffusion effect and euryhalinity in teleosts. J. gen. Physiol.50, 391–422 (1966)Google Scholar
  15. Motais, R., Maetz, J.: Comparison des échanges de sodium chez un téléostéen euryhalin (le flet) et un téléostéen stenohalin (le serran), en eau de mer. Importance relative du tube digestif et de la branchie dans as échanges. C. Roc. Biol. (Paris)261, 532–535 (1965)Google Scholar
  16. Motais, R.: Les mécanismes d'échanges ioniques branchiaux chez les téléostéens. Ann Inst. Oceanogr.45, 1–83 (1967)Google Scholar
  17. Potts, W. T. W., Fleming, W. R.: The effect of environmental calcium and ovine prolactin on sodium balance inFundulus kansae. J. exp. Biol.55, 63–76 (1971)Google Scholar
  18. Potts, W. T. W., Foster, M. A.: Stather, J. W.: Salt and water balance in salmon smolts. J. exp. Biol.52, 553–564 (1970)Google Scholar
  19. Smith, P. G.: The ionic relations ofArtemia salina (L.). I. Measurements of electrical potential difference and resistance. J. exp. Biol.51, 727–738 (1969a)Google Scholar
  20. Smith, P. G.: The ionic relations ofArtemia salina (L.) II. Fluxes of sodium, chloride and water. J. exp. Biol.51, 739–758 (1969b)Google Scholar
  21. Smith, W. H.: The absorption and excretion of water and salts by marine teleosts. Amer. J. Physiol.93, 480–505 (1930)Google Scholar
  22. Wood, C. M., Randall, D. J.: The effect of anaemia on ion exchange in the southern flounderParalichthys lethostigma. Comp. Biochem. Physiol.39, 391–402 (1971)Google Scholar

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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