Indonesia is currently faced with a variety of problems, including relating to increasing food demand and prices, increasingly scarce clean water, and poverty. Therefore, the development of aquaponics technology has been carried out, which integrates aquaculture and hydroponics. This study was conducted to compare water quality (pH, temperature, ammonia, nitrite, and nitrate) produced from 2 different systems, namely aquaponic with modified conventional aquaculture systems. In an aquaponic system, water recirculation follows the steps: Water from a fish pond tank (FPT), flows to mechanical tanks-1(MT-1), biofilter tanks (BT), mechanical tanks-2 (MT-2), to hydroponic plants (HP), and finally back to FPT, and so on. While conventional aquaculture systems, water recirculation is only through FPT, MT, and BT. The results were obtained for aquaponic (ammonia 0.350-5.946 mg/L, nitrite 0.193-0.880 mg/L and nitrate 1.031-5.542 mg/L), and for modified conventional aquaculture systems (ammonia 0.350-9.353 mg/L, nitrite 0.114-0.880 mg/L and nitrate 0.949-1.031 mg/L). While the pH and temperature values for the two systems are the same, pH 7.18-8.9, and water temperature 26.7-30.0°C.
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