Video: The threat of blue algae blooms in the rivers and lakes

Green algae or cyanobacteria, which can be found in all waters, warm temperatures with excessive phosphorus and nitrogen can cause algal blooms to develop, called algal blooms.

Algae bloom.

Most algae bloom harmlessly, but some cyanobacteria can produce toxins, causing damage to the central nervous system and liver.

US authorities are forced to warn people after discovering some lakes and rivers with green algae that contain dangerous toxins.