While, many translations of the Bible have found this mistake and thrown it out, I have come across several copies with the following in them:
God, in his infinite wisdom decides to drown some fish (because they are of course violent and corrupt fish). This is what is says (quote) in Genesis 6:07.
"And the Lord said, I do bring a flood to destroy man whom I have created from the face of the Earth; both man of the Earth, beasts of the land, the fowls of the air, the great whales of the sea, the fish of the water and every creeping thing that creepeth upon the Earth".