Seasonal changes in the plasma levels of glycoprotein antifreeze, Na + , Cl − , and glucose in Newfoundland Atlantic cod ( Gadus morhua )

A seasonal study was carried out on the hematocrits, plasma freezing point depression, and thermal hysteresis, and plasma Na + , Cl − , total protein, and glucose concentrations in laboratory maintained Atlantic cod. Significant thermal hysteresis was evident in the plasma during the months of Janua...

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Bibliographic Details
Published in:Canadian Journal of Zoology
Main Authors: Fletcher, G. L., Slaughter, D., Hew, C. L.
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 1982
Subjects:
Animal Science and Zoology
Ecology, Evolution, Behavior and Systematics
atlantic cod
Gadus morhua
Newfoundland
Online Access:http://dx.doi.org/10.1139/z82-240
http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-240
Description
Summary:A seasonal study was carried out on the hematocrits, plasma freezing point depression, and thermal hysteresis, and plasma Na + , Cl − , total protein, and glucose concentrations in laboratory maintained Atlantic cod. Significant thermal hysteresis was evident in the plasma during the months of January to May indicating the presence of antifreeze glycoproteins. Plasma freezing point depression and Na + and Cl − concentrations were highest during the winter months and lowest during the summer. Two peaks in glucose levels were evident; one in February and the other in July. No seasonal changes were evident in hematocrits and total plasma protein concentrations.

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