Fish and birds survived
Most birds can't swim.
With the earth literally 100% covered in water, the salinity of the water would be consistent worldwide. So did the freshwater fish die? Or the saltwater fish? Or both?
I guess the seagulls and the ducks were OK.
Oh. Except for not having anything to eat for a year.
Everything died.
Except all vegetation. Olive trees, and everything else, survived after an entire year underwater and without sunlight.
OK, gotta stop. Trying to think this stupidly makes my head hurt.