Remember, no flood, so nothing to impress me here as far as that goes. Seriously, combined with the excess of rotting material, the only things in the water that would likely survive is bacteria, making the oceans into a festering mess of biohazard.
Probably not. Quick beer math gives me about 1Kg of biomass per square meter of surface area for the earth. Only a small fraction of that will be animal mass. Dilute that through a water column and you can see how much of a non issue it would be. One big thing to consider is how much water you would need to add to flood the earth. Seriously, orders of magnitude more water than exists on earth as I recall.
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