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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.
Water that has non volatile solutes dissolved in it will have a lower vapor pressure and will evaporate more slowly than pure water. Thus, seawater for example, will not evaporate as fast as distilled water. I don't know what is in your tap water, or lake or river water. Presumably they have dissolved solids, so they too will evaporate more slowly than distilled water. The more particles dissolved in a given volume of water, the more slowly it will evaporate, because of the reduced vapor pressure. Yeah, it is ENDOTHERMIC.