The Third Vial
Blood on the Rivers and Fountains
Revelation 16:4-7

"And the Third Angel poured out his Vial upon the rivers and fountains of waters; and they became blood.
And I heard the Angel of the Waters say, Thou art righteous, O Lord, which art and wast and shalt be because Thou hast judged thus.
For they have shed the blood of saints and prophets and Thou hast given them blood to drink; for they are worthy.
And I heard another out of the Altar say, even so, Lord God Almighty, true and righteous are Thy judgments."

       This is a repetition of the First Egyptian Plague.  When the waters of Egypt were turned to blood all the fish died. Here nothing is said about the life in the rivers or ponds.