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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.
Cold water can cause a sudden drop in body temperature. Photo Credit: shanesabin/iStock/Getty Images Like any other medical symptom, a sudden drop in body temperature can have many causes, some of which are quite normal. For example, people typically experience a rapid drop in body temperature before sleep, and women experience a drop in temperature each month before menstruation begins. And everyone is familiar with the sudden drop in temperature after an illness, when a fever is said to break.