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Osmotic regulation in the embryo of the herring (Clupea harengus)

Published online by Cambridge University Press:  11 May 2009

F. G. T. Holliday  and
M. Pattie Jones
F. G. T. Holliday
Affiliation:
Department of Natural History, University of Aberdeen
M. Pattie Jones
Affiliation:
Department of Natural History, University of Aberdeen
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Extract

Just before spawning the semen of the herring is isosmotic with the parent blood, the eggs are hyposmotic. Immediately the eggs are placed in sea water of salinities 5, 17·5, 35 and 50 %0 there is a change in the freezing-point of the yolk indicating that it has approached close to being isosmotic with the water. Changes in the freezing-point of the yolk during development indicate that the overgrowing embryo gradually regulates the osmotic concentration of the yolk, although full regulation is not achieved until after the closing of the blastopore. After this point there is no significant change in the freezing-point of the yolk or body fluids. Regulation is most probably brought about by the activity of the cells of the ectoderm.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 45 , Issue 2 , June 1965 , pp. 305 - 311
Copyright
Copyright © Marine Biological Association of the United Kingdom 1965

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References

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