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Abstract
The most essential natural resource that is needed by all living life forms is the aquatic systems. The elevated levels of pollutants in aquatic systems may cause harm to the ecosystem and living organisms. We aim to develop a simple economic methodology of studied pollutant (such as insecticide and heavy metals) removal from aquatic ecosystems in Egypt by using fish organic and biological waste (such as chitosan). Also, investigate the molecular variation in fish (stress protein alternation) due to the studied pollutants