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Osmotic adjustment in the euryhaline teleostAphanius dispar (Cyprinodontidae)

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Summary

Osmotic pressure and concentration of chloride, sodium and potassium in plasma and total water contents in the euryhaline teleostAplianius dispar were examined.

In different salinities the osmotic pressure and chloride concentration change significantly: osmotic pressure was 366.1 μOsmole/gram in fresh water and 681 μOsmole/gram in 400% sea water. Chloride 137 μM/gram in fresh water and up to 285.7 μM/gram in 400% sea water.

The sodium concentration was relatively stable: 169 μM/gram in fresh water, 205.6 μM/gram in 300% sea water.

The water content in all media examined remained constant at about 74% of wet weight, and only at 100% of sea water it was 72.4%.

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Authors and Affiliations

  1. Department of Zoology, Hebrew University, Jerusalem, Israel

    Ruth Lotan

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  1. Ruth Lotan
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Additional information

I want to express my deep gratitude to the management of the ATLIT Salt Company which for years aided my collections in the salines, and to Mr. H. Zinner for his valuable advice on the manuscript.

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Lotan, R. Osmotic adjustment in the euryhaline teleostAphanius dispar (Cyprinodontidae). Z. Vergl. Physiol. 75, 383–387 (1971). https://doi.org/10.1007/BF00630558

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  • DOI: https://doi.org/10.1007/BF00630558

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