What natural bodies of water demonstrate should be self-evident, most water bodies primarily support life by some form of water movement or turbulence, not from bubbles rising from within their depths (which is not to altogether rule this out from every body of water). Some natural surface turbulence creates bubbles (so can surface splashing in an aquarium). Powered by gravity, the sun, etc. these free sources of kinetic energy are "efficient" in their own particular sense.
This does not disprove your point about oxygen transfer from bubbles. It does serve as a model for why aquariums with favorable water volume, stock levels, surface area, and surface water movement are often sufficient to support fish without something additional to inject bubbles. If in a particular tank this is not sufficient, a primary mechanism for why adding an air pump is an efficient remedy is evident from your information.
That's all. I'm not taking the bait of "folk science" to lose objectivity on this or to further debate something that's already clear.
This does not disprove your point about oxygen transfer from bubbles. It does serve as a model for why aquariums with favorable water volume, stock levels, surface area, and surface water movement are often sufficient to support fish without something additional to inject bubbles. If in a particular tank this is not sufficient, a primary mechanism for why adding an air pump is an efficient remedy is evident from your information.
That's all. I'm not taking the bait of "folk science" to lose objectivity on this or to further debate something that's already clear.