Excellent evaluation.
The oceans are similar to storms in the sky.
Density of salinity in the ocean would look like clouds on radar.
Sonar reveals many currents that reflect atmospheric activities.
Hence "no more sea"
There would've likely been a loss of fish during the flood.
But many fresh and saltwater species would've survived and provided schools to provide for future generations due to the time allotted and the physics of fluid saturation.
Blessings Always
There are quite a few biological factors along with physics.
The Amazon river of fresh water extends 100 or so miles into the Atlantic ocean.
There are also many accounts of fish species able to endure beyond brackish waters.
One is the bull shark that swims inland into fresh water rivers...
Do any readers here know how and why a king snake devoured 2 venomous serpents?
Hint.
A scarlet thread reveals beauty
Like a staff gifted to a very good friend.
Shepherding is about trust.
Blessings Always
ח וְשִׁעֲשַׁע יוֹנֵק, עַל-חֻר פָּתֶן; וְעַל מְאוּרַת צִפְעוֹנִי, גָּמוּל יָדוֹ הָדָה.
8 And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the basilisk's den.