He gave them power of procreation and fruitfulness, which is justly mentioned as a great blessing, Psalms 128:3-4.
Fill the waters in the seas; and consequently in the rivers, which come from the sea, and return into it.
Let fowl multiply in the earth, where they shall commonly have their habitation, though they had their original from the waters; of which see Poole on " Genesis 1:20 ".