Red tide

Trichodesmium erythraeum caused blooms in red sea

“And the river will run red with blood”. Red tide in Florida seems pretty biblical to me!

Researchers have found that human activity helps power and provides fuel for naturally occurring Red Tide events.

"Red Tide" or "Crimson Tide" a.k.a. Toxic Algal Bloom. ....currently killing off living creatures of the sea .... "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." Revelations 16:3 KJV

Photo about Many dead fishes have been washed up to a beach during an algal bloom. People, building and ocean in the background. Image of beach, negative, algae - 11760936

Crimson tide or red tide, caused by plankton.

blood sea in brazil | blood red water brazil, red tide photo, amazing red tide brazil 2015 ...

In the ocean, microscopic forms of algae, known as dinoflagellates , can "bloom" into dense patches near the surface, often referred to as "red...