Artificial aeration of lakes and reservoirs can be accomplished either by total mixing (Destratification) or by aeration/oxygenation of the hypolimnion without thermal destratification (Hypolimnetic Aeration). Destratification results in the elimination of oxygen depletions, but it also eliminates cold waters. With destratification, the entire lake becomes as warm as the surface waters without destratification. This may create unsuitable thermal conditions for coldwater fishes. Hypolimnetic aeration will maintain cold. Waters while at the same time eliminate hypolimnetic oxygen depletion. This will allow the yearlong survival of coldwater fishes. Hypolimnetic aeration can be accomplished by using compressed air, liquid oxygen or mechanical means.
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