GW asks: "Would daytime aeration on those cloudy windless days tend to achieve DO saturation that otherwise would not have been met?" and "How likely is a DO related fish kill in a daytime aerated pond vs the same pond with no aeration at all."
Day aeration on cloudy windless days no doubt helps increase DO in the water toward 100% saturated levels. As I mentioned earlier one of the biggest benefits of day aeration is adding oxygen to the deeper waters beyond the depth of photosynthesis (euphotic zone). The larger and more voluminous the water is below euphotic depth the less likely a fish kill will occur providing the deep water starts off with saturated or near saturated DO. This concept is why deeper ponds are better in the northern snow belt. Everything else being equal, total DO will last longer in a deeper oxygen saturated pond vs the same sized shallower pond. The pond with deeper DO saturated water has a larger "bank account" of DO than the same sized shallow pond.
I'm not sure of the likelyhood or percentages, but deeper DO saturated is much better than shallow DO saturated.
Last edited by Bill Cody; 06/28/08 09:42 PM.
