Aquaponics Production of Indian Catfish Clarias magur (Hamilton, 1822) Integrated with Lettuce (Lactuca sativa L.): Comparison with Controlled and Conventional Production Systems
Abstract
The integration of aquaculture and hydroponics through aquaponics has emerged as a promising strategy to address the increasing demand for sustainable food production under conditions of limited land and freshwater resources. Fish performance was compared among aquaponic, recirculating aquaculture, and conventional tank systems, while lettuce productivity was assessed under aquaponic, hydroponic, and conventional soil-based cultivation across five consecutive 42-day crop cycles (CC1–CC5). Aquaponics significantly improved water quality by reducing residual ammonia, nitrite, phosphate, electrical conductivity, and total dissolved solids while maintaining dissolved oxygen and pH within favourable ranges for fish growth (p < 0.05). Consequently, C. magur reared in AQPS1 exhibited superior growth performance, achieving the highest final weight (143.05 ± 13.04 g), specific growth rate (2.43 ± 0.11% day⁻¹), thermal growth coefficient (0.78 ± 0.01), survival rate (95.83 ± 2.89%), and net biomass yield (5448.96 ± 98.53 g), together with the lowest feed conversion ratio (2.21 ± 0.03) (p < 0.05). For lettuce production, aquaponics progressively outperformed hydroponic and soil-based systems as the system matured, recording the highest plant biomass (58.43 ± 9.66 g) and maximum yield of 1168.77 ± 63.05 g m⁻² during the third crop cycle. These findings demonstrate that NFT-based aquaponics effectively couples fish and vegetable production while enhancing nutrient recycling, improving water quality, increasing productivity, and reducing environmental losses compared with conventional systems. The integration of C. magur and lettuce therefore represents a viable and climate-resilient food production model with considerable potential for adoption in resource-constrained regions of developing countries.
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