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Aquaponics are modern production systems, which integrate the aquaculture technology with hydroponic systems (vegetable production without soil) with a goal of fructification of residual nutrients resulted from metabolic activity of fish biomass as high quality vegetable biomass sealable as ecological products. In the present study, as a first step in aquaponic recirculating systems evaluation, the authors aim to compare two types of recirculating systems: classical (hereby noted with RAS) and integrated/aquaponic (RAS_A) regarding water quality parameters generally, and TAN (total ammonia nitrogen) production and transformation, particularly.