Commentary for Psalms 8:9

Fowl of heaven and fish of the sea: – He says: Even over those which are not in the earth with him, as the fowl which flies in the air, and the fishes which swim in the waters, he rules over all and snares them by his cunning devices. And further, by his understanding and his cunning devices

He passes over the paths of the sea: – in that he makes ships and passes in them over the paths of the sea.