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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.
If the water temperature changes by even a few degrees, it could indicate a source of unnatural warming of the water or thermal pollution. Thermal pollution caused by human activities is one factor that can affect water temperature. Many industries use river water in their processes.