How can some fish survive in freezing waters without their body fluids freezing?



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    Fish can survive in nearly freezing waters because the water underneath ice stays warmer than the water above. Generally around 4 degrees Celcius which does not drop easily. Heat does not pass through the ice so is trapped underneath. The body fluid of an ordinary fish has been said to freeze at -5 Degrees Celcius, in which case they would die. Goldfish for instance don’t have any special properties but they can lower their metabolism and survive a long winter as long as their ponds don’t freeze completely. Some cod, flatfish and polar fish have a low metabolic rate and have antifreeze molecules called glycoprotein. This lowers the freezing point of fishy bodily fluids. They have amazing natural defenses against the sharp cold breath of an icy death.

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