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The environmental friendly aquaculture system called "Biofloc Technology (BFT)" is considered as an efficient alternative to the present super intensive aquaculture system since nutrients could be continuously recycled and reused. The sustainable approach of biofloc technology system is based on growth of beneficial microorganism in the culture medium, benefited by the minimum or zero water exchange. These microorganisms (biofloc) has two major roles: (i) maintenance of water quality, by the uptake of nitrogen compounds generating "in situ" microbial protein; and (ii) nutrition, increasing...