Anthropogenic activities, as well, domestic and industrial waste sewer without any treatment and extended utilization of fertilizer at agriculture, contaminating rivers, lakes and fountains, which are making increase the level of nutrients in our water, causing an artificial enrichment of the ecosystem, named as artificial "eutrofization", whose main consequence is the bloom. Bloom is caused by an intense growing of micro seaweed at water surface, making a dense cell layer with several centimeters of profundity. Many cyanobacterias make toxins called cyanotoxines, what can cause damage to humans and animals (when founded at recreation area/consume). Cyanotoxines can be divided in 3 groups: neurotoxic, hepatotoxic and dermatoxic. The occurrence of cyanobacterias bloom is controlled for several environmental factors, like luminosity, temperature, ph, nitrogen and phosphorus concentrations. The predominance of toxic cyanobacterias at eutrofized ambiences is a growing problem in the world.

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