Abstract
Aquaponics is a cultivation system that combines aquaculture and agricultural hydroponics. This study investigated water quality changes and growth of fish (siberian sturgeon) and leafy vegetables (basil and four leafy vegetables) through the use of nitrifying autotrophic bacteria alone (Auto+CO2)and the mixed use of heterotrophic and autotrophic microorganism (Hetero+HBFT) in operation of aquaponic system. After basil stocking (5-8 weeks) in EXP1, Auto+CO2 experimental groups showed rapid water quality stabilization for about 2 weeks compared to Hetero+HBFT groups, but the lattergroups showed significantly higher growth of both fish and basil (P0.05).. In EXP2 (9-12 weeks), the growth factors of fish and 4 kinds of european lettuce cultivars in Hetero+HBFT experimental groups were higher than Auto+CO₂ groups. In hematological ananlysis [hematocrit (PCV, %), hemoglobin (g/dL), GOT (U/L), GPT (U/L), ALB (g/dL), GLU (mg/dL), plasma Na, K, Cl (mEq/L) and inorganic phosphorus (mg/dL)] between two experimental groups, all items were not significantly different at the end of the experimental period (P0.05). This study shows that for aquaponics water quality management, it is more effective to use it in combination with heterotrophic bacteria rather than autotrophic bacteria alone to stabilize water quality.
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