Plague 1 -- water turned into blood; fish died Dr. Stephen Pflugmacher, a biologist at the Leibniz Institute for Water Ecology and Inland Fisheries in Berlin believes that rising temperatures could have turned the Nile into a slow - moving, muddy watercourse -- conditions favorable for the spread of toxic fresh water algae. As the alga Planktothrix rubescens dies, it turns the water red in a phenomenon known as "Burgundy Blood ''. Alternatively, a bloody appearance could be due to an environmental change, such as a drought, which could have contributed to the spread of the Chromatiaceae bacteria which thrive in stagnant, oxygen - deprived water.
what was the first plague god sent on egypt
water turned into blood