Biointegration of Rohu (Labeo rohita) Fry and Lemon Grass (Cymbopogon citratus) in a Recirculating Aquaponic System
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Keywords:
Aquaponic system, Component ratio, Lemon grass, RohuAbstract
A 75-day experiment was conducted to optimize fish and plant component ratio in a recirculating aquaponic system. Three treatments having different component ratio of rohu (Labeo rohita) fry to lemon grass (Cymbopogon citratus) viz. T1 (3:1), T2 (4.5:1) and T3 (6:1) were assigned as treatments. All the treatments were compared for fish growth, plant growth, survival of fish, and various water quality parameters were observed to determine the best component ratio which maintains better water quality and gives better growth. The water quality parameters like temperature, pH, dissolved oxygen, total alkalinity, and total hardness were found to be within the acceptable limits for fish as well as plant growth. While total ammonia nitrogen (TAN) varied in the range of 0.09 to 0.17 mg L-1, the nitrite and nitrate values ranged from 0.06 to 0.08 mg L-1 and 2.74 to 5.30 mg L-1 respectively. Different component ratio showed significant effect on fish growth in terms of length and weight gain, survival rate, specific growth rate (SGR). Among the treatments, the higher growth rate of fish was observed in T1 (2.54±0.01 g) followed by T2 (2.25±0.03 g) and T3 (2.10±0.02 g) but on comparing the total fish biomass produced in the system, the treatment T3 yielded maximum production as the fish biomass was the highest in T3 (121.08 g) followed by T2 (96.18 g) and T1 (73.81 g). The highest plant growth was achieved in T3 (19.94±0.10 g) followed by T2 (19.35±0.07 g) and T1 (19.04±0.12). Therefore, considering total fish biomass production and plant growth together in the system, it can be concluded that the component ratio of 6:1 (T3) can be recommended for culturing rohu fry and lemon grass in recirculating aquaponic system.
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