beso The dilution would have been about 50% which means many /most marine animals would have died as well as most of the fresh water ones, for opposite reasons.
They would all have died anyway ,the same as the land animals from the 15,000 psi pressure .
When the water evaporated the salt would be precipitated onto all the land
killing most of the microganisms who were still alive. , leaving it sterile.
Once the water evaporated it would be suspended once more in the atmosphere, ( where else would it go ) making the pressure 15,000 psi. again.
So the choice of death is bing impossible to breath , being drowned or crushed.
For all these reasons the ark could not have been built , and had it been many years before the atmosphere became 100% saturated , then it too would have been crushed flat like every other building and plant life.
The only thing that would survive the flood would be hard rock. Remember also the arctic and antarctic, all the deserts and the tropics would be destroyed and with it the worlds climate.