We may think that why don't the Arctic fish fish freeze...?
Fish are cold blooded animals whose body temperature changes according to the surroundings. So, normally at the below freezing temperature of Arctic, fish should be freezing or they shouldn't be living there at all! The puzzle has been solved by scientists who have discovered that the fish do possess some antifreeze substance in their blood. The Arctic sculpin, manufactures an antifreeze protein in its blood. This depresses the freezing temperature of its plasma sufficiently.
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