Freezing Resistance in Polar Fishes

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Science  14 Apr 1972:
Vol. 176, Issue 4031, pp. 184-186
DOI: 10.1126/science.176.4031.184


Arctic and antarctic fishes, living in contact with sea ice at -1.9°C, have plasma equilibrium freezing points near -1.2°C which are dependent on salt concentrations. These supercooled fishes have plasma protein concentrations much higher than other polar animals have, and the proteins impede ice propagation at temperatures down to -2°C. Plasma protein concentration increases as environmental water temperature decreases.