What is algae bloom?

Algae bloom or algal bloom is an obvious appearance or rapid increase and accumulation of millions of algae and tiny plant-like organisms in the water. The blooms of these microscopic algae or phytoplankton is the result of abundant sunlight, nutrients, and the right water conditions. These blooms may take place in freshwater and in marine environments as well. They come in different colors, cyanobacteria blooms for instance are often blue-green which literally means that blue-green algae comes to bloom.