Icefish (Notothenioidei)
The Antarctic icefish belong to the perciform and are the largely endemic, dominant fish taxa in the cold continental shelf waters surrounding Antarctica. The majority of Notothenioids live at seawater temperatures between of -2°C and 4°C. It is possible to have seawater temperatures below the freezing point of fresh water (0°C) because dissolved salts lower the freezing point of a solution in a colligate manner. Antarctic icefish has no red blood cells. Direct absorption from seawater affords sufficient oxygen for its slow metabolism.
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