Why is eutrophication harmful?

Why is eutrophication harmful?

Why is eutrophication harmful? Algae feed on the nutrients, growing, spreading, and turning the water green. Algal blooms can smell bad, block sunlight, and even release toxins in some cases.  When algae die, they are decomposed by bacteria—this process consumes the oxygen dissolved in the water and needed by fish and other aquatic life to "breathe". If enough oxygen is removed, the water can become hypoxic, where there is not enough oxygen to sustain life, creating a "dead zone". .