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Pollution or poisoning of ecosystems is suicide for humanity. In the case of aquatic resources, it is a harmful modification of the quality of water caused by substances that can change its quality, aesthetic appearance and its use for human purposes (SIMOENS and MICHA, 1995).Agriculture, urbanization and industrialization discharge millions of tons of pollutants into water bodies every year, thus disturbing the structure and physiology of aquatic ecosystems (MUSIBONO(a), 2002).