Many fish thrive in Antarctic waters where the temperature is always below zero. How do they manage to keep their body fluids from freezing?

their bodies have homeostasis which helps them do so. their temperature, texture, metabolism and osmotic concentration of minerals would be suitable for freezing temperatures
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Presence of natural anifreeze like ethylene glycol in their body prevent them from freezing.
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at the bottom of the ocean ,water of maximum density exists that is 4 degree celcius,,,, that is why fish survives
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