The possibilities of an integrated production of fish and plant in the same process water - aquaponics - was investigated in this work. In order to gain an overview of the nutrient properties of process waters of such plants, three aquaculture recirculation plants, African catfish (Clarias gariepinus), were produced in the long-term trial and under three different stocking densities, each under five different production conditions. Relevant production parameters and the resulting water parameters showed a conditional usability of the process waters for aquaponic use.<eng>
