Component ratio, determination of the optimum hydraulic loading rate (HLR), and potassium (K+) dosage are important factors for the best yield of the tomato (Solanum lycopersicum var. ceraciformes) plant and pearlspot (Etroplus suratensis) in an aquaponic system. Considering the overall fish growth, health monitoring parameters, plant growth, and water quality parameters, the potassium (K+) dose of 80 mg l-1was found to be the most effective for tomato yield compared to other treatments. Experiments displayed that fish stocking density (0.86 kg m-3), Hydraulic Loading Rate (3.0 m day-1) and K+ dosage (80 mg l-1) showed a positive effect on Pearlspot and tomato crops.