I have three outdoor fish pot ponds. They are taller then they are wide. Now this mean the surface area meeting the atmosphere is quite small compared to the volume.
I was under the impression, that it's the surface of the pond that helps to bring oxygen into the water. I could be totally mistaken about this.
I am wondering if there is any information about pond depth and the surface area exposed to the atmosphere and the environment health, in such, as being optimal for fish.
Please this is not a question about artificial filtration, it is about possible exchanges made at the surface of the pond and any possible natural conventions created within the pond.