Summary
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1.
Transfer of the freshwater cyprinodont,Fundulus catenatus, into 40% sea water caused a slow rise in serum sodium levels, total body sodium, and the rate of sodium efflux.
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2.
Serum sodium levels were first reduced by expanding sodium space. In some cases the animals eventually brought sodium parameters (except efflux) back to fresh water levels; in other cases the sodium space remained expanded.
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3.
Transfer of animals adapted to 40% sea water on to 52% or 65% sea water caused a second rise in the sodium load and expansion of the sodium space. The animals could not survive indefinitely in 65% sea water.
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4.
Water permeability first decreased, and then increased after transfer into saline. The chenges in water permeability correlated roughly with changes in serum cortisol levels.
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5.
The animals remained hyposmotic to the environment in both 40% and 65% sea water and drank sufficient sea water to stay in positive water balance. They were not able carry out a net excretion of sodium in salinities above 40% sea water.
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Duff, D.W., Fleming, W.R. Sodium metabolism of the freshwater cyprinodont,Fundulus catenatus . J. Comp. Physiol. 80, 179–189 (1972). https://doi.org/10.1007/BF00696489
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DOI: https://doi.org/10.1007/BF00696489