Optimization of stocking density and its effects on Climbing Perch (Anabas testudineus) cum spinach (Spinacia oleracea) based aquaponic system
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Abstract
Aquaponic system combines fish culture with hydroponic system for the enrichment of the land value. A small scale aquaponic system was studied for 60 days to investigate fish and plant growth as well as its economic viability using Anabas testudineus as the fish component and spinach as the hydroponic component. Fishes were stocked with three different stocking densities viz., 200 nos. m- ³ (T1), 300 nos. m- ³ (T2) and 400 nos. m- ³ (T3) in triplicates with spinach as plant component in hydroponic beds @ 40 plants/m². In control (T0) A. testudineus were stocked @ 200 nos. m-³with triplicates, where no aquaponics was done. Among various growth parameters weight gain, weight gain percentage, specific growth rate, daily increment, daily growth index, FER and PER of fish were higher in T1 followed by T2, T3 and least was in T0. Fish survival did not vary with high stocking densities. Hence, yield of the fishes was found to be more in T3. Growth parameters of spinach (Spinacia oleracea) such as plant height, height gain, percentage height gain, leaf length, leaf width, plant growth rate and yield during the RESEARCH PAPER experimental period were higher in T3 followed by T2 and T1. Throughout the culture period, highest growth of spinach was recorded in highest fish density, which might be due to availability of more fish waste and nutrients for plants with higher stocking densities of fish. Economic evaluation of the study showed higher benefit cost ratio in T3 (1.53) where fish was stocked @400 nos. m- ³ with spinach @40 m-2 followed by T2 (1.49), T1 (1.14) which may be due to the higher stocking density of fish which helps in more yield of both fish and plant. Thus, an aquaponic system with 400 nos. m-3 of A. testudineus in combination with spinach @ 40 nos. m- ² was more economically viable for farming practices. Further research is necessary to optimize highest stocking density of both fish and plant to get maximum profit from intensive aquaponic system with sustainable strategies.
Key words Anabas testudineus; Aquaponic system; Spinacia oleracea; stocking density; B:C
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