The First Plague
Revelation 16:03-And the second angel poured out his vial upon the sea; and it became as the blood of a dead man: and every living soul died in the sea.
04 - And the third angel poured out his vial upon the rivers and fountains of waters; and they became blood.
Exodus 7:20 - And Moses and Aaron did so, as the Lord commanded; and he lifted up the rod, and smote the waters that were in the river, in the sight of Pharaoh, and in the sight of his servants; and all the waters that were in the river were turned to blood.