Integrated aquaponic systems offer a promising solution for increasing food productivity and water-use efficiency, particularly in hilly regions such as Padang where freshwater availability and land suitability are limited. This study aimed to evaluate the productivity and water-use performance of Nile tilapia (Oreochromis niloticus) cultured in combination with hydroponic plants under different aquaponic treatments. Using a randomized complete block design, one control and three nutrient-enhanced aquaponic treatments were applied, each with four replicates. Fish growth, feed conversion ratio, survival, plant biomass, and water quality were monitored over a 60-day period. The results showed significant differences among treatments (p < 0.05), with the highest nutrient-supplemented aquaponic system producing the greatest tilapia final weight, specific growth rate, and hydroponic fresh biomass. Strong positive correlations (r ≈ 0.98) were observed between fish performance and plant yield, indicating efficient nutrient recycling. Overall, the improved aquaponic treatment demonstrated the best productivity and water-use efficiency, highlighting its potential for sustainable food production in water-limited environments.
