proliferation of living algae on the surface of lakes, streams, ponds, estuary, bay, or ocean. Often associated with high nutrient levels in the water column.

A proliferation of algae in a body of water often associated with excess nutrients (especially phosphorus and nitrogen) in the water column and/or sediments.

rapid growth of algae on the surface of lakes, streams or ponds; stimulated by nutrient enrichment.

a situation often caused by excess nutrients whereby algae grow and reproduce rapidly, often forming dense mats on the surface of the water. Algae blooms can cause unpleasant conditions for swimmers or boaters.

The rapid growth of algae that usually results in discoloration of water with a strong odor. Algae blooms are reported to occur periodically in upper Grand Lake due to the input of sewage and other organic materials from major sources.