Genesis 1:21

And God created great whales, and every living creature that moveth, which the waters brought forth abundantly, after their kind, and every winged fowl after his kind: and God saw that it was good.

1. Included in the creative acts during this day was the creation of great whales.
2. This is not terribly clear, but I get the sense that once God had created each of the animals in the sea and air that they multiplied, each reproducing their own kind. That animals reproduced their own kind would seem to oppose the theory of evolution as it pertains to the development of new species or kind.
3. God recognized that the result of all this creative effort was good.