Blessed them. - We are brought into a new sphere of creation on this day, and we meet with a new act of the Almighty. To bless is to wish, and, in the case of God, to will some good to the object of the blessing. The blessing here pronounced upon the fish and the fowl is that of abundant increase.

Bear. - This refers to the propagation of the species.

Multiply. - This notifies the abundance of the offspring.

Fill the waters. - Let them be fully stocked.

In the seas. - The "sea" of Scripture includes the lake, and, by parity of reason, the rivers, which are the feeders of both. This blessing seems to indicate that, whereas in the case of some plants many individuals of the same species were simultaneously created, so as to produce a universal covering of verdure for the land and an abundant supply of aliment for the animals about to be created - in regard to these animals a single pair only, at all events of the larger kinds, was at first called into being, from which, by the potent blessing of the Creator, was propagated the multitude by which the waters and the air were peopled.

Let fowl multiply in the earth - It is truly astonishing with what care, wisdom, and minute skill God has formed the different genera and species of birds, whether intended to live chiefly on land or in water. The structure of a single feather affords a world of wonders; and as God made the fowls that they might fly in the firmament of heaven, Genesis 1:20, so he has adapted the form of their bodies, and the structure and disposition of their plumage, for that very purpose. The head and neck in flying are drawn principally within the breast-bone, so that the whole under part exhibits the appearance of a ship's hull. The wings are made use of as sails, or rather oars, and the tail as a helm or rudder. By means of these the creature is not only able to preserve the center of gravity, but also to go with vast speed through the air, either straight forward, circularly, or in any kind of angle, upwards or downwards. In these also God has shown his skill and his power in the great and in the little - in the vast ostrich and cassowary, and In the beautiful humming-bird, which in plumage excels the splendor of the peacock, and in size is almost on a level with the bee.

And God blessed them,.... With a power to procreate their kind, and continue their species, as it is interpreted in the next clause,

saying, be fruitful, and multiply, and fill the waters in the seas: and these creatures do multiply exceedingly, and vast quantities there are of them in the mighty waters, though the consumption of some sorts of them is very great. Our English word "fish" is derived from the Hebrew word "fush", which signifies to multiply and increase:

and let fowl multiply in the earth; as they did, and continue to do to this day.

And God {r} blessed them, saying, Be fruitful, and multiply, and fill the waters in the seas, and let fowl multiply in the earth.

(r) That is, by the virtue of his word he gave power to his creatures to reproduce.

1:20-23 Each day hitherto hath produced very excellent beings, but we do not read of the creation of any living creature till the fifth day. The work of creation not only proceeded gradually from one thing to another, but advanced gradually from that which was less excellent, to that which was more so. 'Twas on the fifth day that the fish and fowl were created, and both out of the waters. Observe,
1. The making of the fish and fowl at first. Ge 1:20,21 God commanded them to be produced, he said, Let the waters bring forth abundantly - The fish in the waters, and the fowl out of them. This command he himself executed, God created great whales, and c. - Insects which are as various as any species of animals, and their structure as curious, were part of this day's work, some of them being allied to the fish, and others to the fowl. Notice is here taken of the various species of fish and fowl, each after their kind; and of the great numbers of both that were produced, for the waters brought forth abundantly; and in particular of great whales the largest of fishes, whose bulk and strength, are remarkable proofs of the power and greatness of the Creator. Observe, 2, The blessing of them in order to their continuance. Life is a wasting thing, its strength is not the strength of stones; therefore the wise Creator not only made the individuals, but provided for the propagating of the several species, Ge 1:22. God blessed them, saying, Be fruitful, and multiply - Fruitfullness is the effect of God's blessing, and must be ascribed to it; the multiplying of the fish and fowl from year to year, is still the fruit of this blessing here.

1:20-25 God commanded the fish and fowl to be produced. This command he himself executed. Insects, which are more numerous than the birds and beasts, and as curious, seem to have been part of this day's work. The Creator's wisdom and power are to be admired as much in an ant as in an elephant. The power of God's providence preserves all things, and fruitfulness is the effect of his blessing.