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In addition, there is potential for physiological distress if a fish swims into a localized warm area of the water. Because of water's high heat capacity, water temperatures do not change rapidly under natural conditions. Thus, fish have not evolved the ability to adapt to rapid temperature fluctuations.
In other words, once water reaches the freezing point or the boiling point, it will stay at that temperature until it has all frozen or boiled away into vapor. Only after it has changed phase completely will the temperature start to change again. As water freezes into solid ice, it releases heat energy.