Guys it is more complex than that. With many variables at work it is hard to guess outcomes.

For example. A 1 acre pond with fish. In 18 mths you reach fish carrying capacity. If you then displace half the water with mud you have half the total DO. If the DO was at 6 with that level of O2 demand and total DO demand stays constant and supply drops in half - you likely have a serious problem.

In addition water is a very good solvent and will pick up lots of stuff if it is inundated with soil.

In short rapid changes in water quality can add stress to the fish. Or if the change is positive (good new water) it can reduce problems.

Fish generally do not like high rates of soil suspension. They can live if the DO is enough. Some species do better than others. Sight feeders can have feeding issues with muddy water for long periods.