Protein and glycoprotein antifreezes in the intestinal fluid of polar fishes.

S. M. O'Grady, J. C. Ellory, A. L. DeVries

Research output: Contribution to journalArticlepeer-review


Measurements of ion concentrations, freezing points and melting points of intestinal fluid were made for several Antarctic fishes and two North Atlantic species. These measurements indicated that plasma and intestinal fluid are nearly isosmotic. Freezing points of intestinal fluid were approximately 0.9 degrees C below the melting points, suggesting the presence of glyco-protein antifreeze within the intestinal fluid of the Antarctic fishes. Polyacrylamide gel electrophoresis and specific immunoprecipitation with glyco-protein antifreeze antibody confirmed the presence of appreciable quantities of antifreeze and showed that the major antifreeze fractions present in the intestinal fluid are low molecular weight glycopeptides.

Original languageEnglish (US)
Pages (from-to)429-438
Number of pages10
JournalJournal of Experimental Biology
StatePublished - Jun 1982
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Aquatic Science
  • Animal Science and Zoology
  • Molecular Biology
  • Insect Science


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