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¹ Central Institute of Fisheries Education, Division of Aquaculture, Panch Marg, Yari Road, Versova, Andheri (W), Mumbai- 400061, India DOI : 10.4194/1303-2712-v17_6_20 Viewed : 4558 - Downloaded : 5896 A 60 days experiment was conducted for standardization of the stocking density proportions of Koi carp (Cyprinus carpio var. koi): Goldfish (Carassius auratus) along with water spinach (Ipomoea aquatica), and for evaluate the performance of recirculating aquaponic system. Different stocking density ratios of Koi carp: Goldfish (1:1=T1; 1:2=T2; 2:1=T3 with aquaponics and 1:1=C without aquaponics) were tested with three replicates, at an initial total fish density of 0.8 kg/m³. Growth of Goldfish was not significant different (P≥0.05) among the treatments. However, the T2 group showed the highest growth for the Koi carp (P<0.05). Significantly higher plant growth (mean plant height 62.98±1.44 cm) was observed for the T2 fish density ratio. Nutrient removal (NO3-N, PO4-P and K) was significantly higher for the T2 density ratio. Thus, Koi carp: Goldfish of 1:2 can be suggested as the optimum stocking density ratio in polyculture aquaponic recirculating system with I. aquatica. Keywords : Aquaponics, goldfish, Koi carp, water spinach, stocking density ratio