This study was conducted over 52 days to evaluate the potential of using the nutrient solution produced from different fish stocking densities on the yield and nutrients leaf content of lettuce cultivated in decoupled recirculation aquaponic systems (DRAPS). In this study, three stocking densities of tilapia were used: 8, 10, and 12 kg m-3, respectively.

The result showed the highest total yield 448 g m-2 was obtained at a low stocking density. Also, the leaf nutrient content of butterhead lettuce for potassium, calcium, magnesium, sodium, iron, and copper was increased with an increased fish stocking density, while for the nitrogen, phosphorus, and manganese, the higher leaf content was obtained at lower stocking density.

Considering the lettuce yield, leaf nutrient contents, and nitrogen dynamics, the stocking density of 8 kg m⁻³ could be suggested as the ideal stocking density for DRAPS.

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