The average temperature range of the South Ocean near Antarctica is -1.9ºC to 2ºC. Remember that the ocean has salt in it which lowers the temperature that the water will freeze (-2ºC) .
However, this temperature range should freeze the blood of the fish that swim in the ocean near Antarctica. Scientists have discovered that these specific fish are able to produce proteins that act as a natural antifreeze.
How did these Antarctica fish obtain this ability?