Abstract
An experiment was conducted at IAAS Paklihawa, Bhairahawa from 6th October 2018 to 15th November 2018 (40 days). An open barrel Aquaponics system with a double factor RCBD type experimental design was used consisting of 3 replications and 2 factors under study. The two factors were boron concentrations (1%, 2% and 3%) and BLM varieties (Marfa Chauda Paat, Manakamana and chinese-430). Marfa Chauda Paat (47.35 gm.) was the highest yielding variety followed by Manakamana (36.42 gm.) and Chinese-430 (26.82 gm.). 1% Boron was found to be the most suitable concentration among the test concentrations for leaf yield. A maximum weight gain of the fish was observed in tank 3 (96.44%) followed by tank 1 (86.26%) and tank 2 (82.18%). An excellent survival percentage of fish was observed as 88.89%, 95.56% and 91.11% in tank 1, 2 and 3 respectively. Similarly, the Average Daily Growth Rate (ADGR) was recorded to be 126.5mg, 91.5mg and 128.25mg in tank 1, 2 and 3 respectively. The Specific Growth Rate (SGR %) was obtained to be 1.26, 1.38 and 1.46 for tank 1, 2 and 3 respectively. Furthermore, final harvest weight of fish was obtained to be 437g, 349.21g and 428.2g in tanks 1, 2 and 3 respectively.
 Int. J. Appl. Sci. Biotechnol. Vol 7(3): 359-364
Highlights
Aquaponics is a Re-circulating Aquaculture System (RAS) that is the integration of Aquaculture and Hydroponics, the former being traditional farming of fishes and the later one, the production of plants in water based nutrient solution
Ammonical water from the aquaculture tank poured into the hydroponics tank by the hydraulic gradient
Fish Growth An overall survival rate of 91.85% (Fig. 3) and weight gain % of 88.29 (Fig. 5) was observed within 40-day experimental duration which is a significant output from the aquaculture unit even though it is the secondary enterprise in case of Aquaponics
Summary
Aquaponics is a Re-circulating Aquaculture System (RAS) that is the integration of Aquaculture and Hydroponics, the former being traditional farming of fishes and the later one, the production of plants in water based nutrient solution. Aquaculture has been an old global tradition in Rome, China, India and other ancient civilizations as recorded in various testaments (Jhingran, 1987). It is a type of soilless culture. The major components in Aquaponics are fish, bio filters, physical infrastructures (fish culture tank, hydroponic tank, Water pumps, water filters, screening house) and inputs to the farming components. The system considers water use efficiency since only 10% of water by volume is recommended to be replaced daily (Blidariu and Grozea, 2011)
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