A rapid increase in the population of algae in freshwater as well as marine environments. Blooms can be recognized by discoloration of the water, which usually turns green, but it can also become yellow-brown or red in color, depending on the species of algae. Accelerated growth of algae is associated with increased concentration of plant fertilizers in the water.

ALGAL BLOOM: "Algal bloom are associated with enormous concentrations of cells per milliliter of water (up to millions of cells per milliliter of water)."

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