Evaluation of Biomass Yield and Water Treatment in Two Aquaponic Systems Using the Dynamic Root Floating Technique (DRF)

The experiment evaluates the food production and water treatment of TAN, NO2−–N, NO3−–N, and PO43− in two aquaponics systems using the dynamic root floating technique (DRF). A separate recirculation aquaculture system (RAS) was used as a control. The fish cultured was Nile tilapia (Oreochromis niloticus). The hydroponic culture in one treatment (PAK) was pak choy (Brassica chinensis,) and in the other (COR) coriander (Coriandrum sativum). Initial and final weights were determined for the fish culture. Final edible fresh weight was determined for the hydroponic plant culture. TAN, NO2−–N, NO3−–N, and PO43− were measured in fish culture and hydroponic culture once a week at two times, morning (9:00 a.m.) and afternoon (3:00 p.m.). The fish biomass production was not different in any treatment (p > 0.05) and the total plant yield was greater (p < 0.05) in PAK than in COR. For the hydroponic culture in the a.m., the PO43− was lower (p < 0.05) in the PAK treatment than in COR, and in the p.m. NO3−–N and PO43− were lower (p < 0.05) in PAK than in COR. The PAK treatment demonstrated higher food production and water treatment efficiency than the other two treatments