Exodus 7:21

“And the fish that are in the Nile will die, and the Nile will become foul, and the Egyptians will be weary of drinking water from the Nile.”’”

and His signs and His works which He did in the midst of Egypt to Pharaoh the king of Egypt and to all his land;

“Then You performed signs and wonders against Pharaoh, Against all his servants and all the people of his land; For You knew that they acted presumptuously toward them, And made a name for Yourself as it is this day.

He turned their waters into blood And caused their fish to die.

And the second angel sounded, and something like a great mountain burning with fire was thrown into the sea; and a third of the sea became blood,

These have the authority to shut up the sky, so that rain will not fall during the days of their prophesying; they also have authority over the waters to turn them into blood, and to strike the earth with every plague, as often as they wish.

And the second angel poured out his bowl into the sea, and it became blood like that of a dead man, and every living thing in the sea died.