Abstract
Aquaponics is a cultivation system that combines aquaculture and agricultural hydroponics. This study investigated the productivity of leafy vegetables cultivated in the hybrid biofloc technology-aquaponics (HBFT-AP) and hydroponics (HP). Yellow koi fish (Cyprinus carpio) were fed an EP diet containing 3% MKP (monobasic potassium phosphate, KH₂PO₄) for 10 weeks in the HBFT-AP. Leafy vegetables of 2 cultivar (ovired lettuce, volare lettuce) were employed in the experiment and water quality [dissolved oxygen (DO, mg/L), pH, water temperature (℃), electrical conductivity (EC; μs/cm), turbidity (NTU), TAN (NH₃ + NH₄SUP+/SUP) (mg/L), NO₂-N (mg/L), NO₃-N (mg/L) and PO₄-P (mg/L)] was measured 6 times a week. Leafy vegetables in HBFT-AP using yellow koi fish fed the EP with MKP 3.0% had a productivity somewhat higher (2 kinds of cultivar) compared to those in HP, and the pH in the HBFT-AP was maintained at the range around 6.0 for 7-10 week. During the 10-week feeding trial, concentration of NO₂-N was kept low in variability while total TAN, NO₃-N and PO₄-P levels increased with time in HBFT-AP. Higher values in hematocrit (PCV, %), hemoglobin (Hb, g/dL) and inorganic phosphorus (mg/dL) were found (P0.05) in fish at the end of the experiment compared to the fish at the beginning of the experiment (initial fish: 27.45%, 12.19 g/dL and 6.39 mg/dL; final fish: 36.26%, 14.52 g/dL and 11.21 mg/dL).
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