"The Antarctic icefish live in water colder than freezing — 2 degrees below zero Centigrade.
Ocean water doesn’t freeze at this temperature because it’s full of salt. The blood of the icefish is less salty than seawater; instead, it keeps itself from freezing by using ice proteins, sometimes called antifreeze proteins, that attach to ice crystals forming in the blood stream.
Once the ice crystals are coated with antifreeze protein, they can’t stick together, so they don’t grow. The icefish of the Antarctic have used this adaptation to become very successful — making up 95% of the fish biomass around Antarctica.
Photo: Uwe Kils”
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