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28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth.
'Three' denotes fullness, and 'a third,' not full.
(References: Arcana Coelestia 2788 [1-13])
9 And he said unto them, I am an Hebrew; and I fear the LORD, the God of heaven, which hath made the sea and the dry land.