An aquaponic system was built on a pilot scale at the Federal University of Grande Dourados, aimed at the sustainable production of Nile Tilapia (Oreochromis niloticus) with intensive recirculation of water, together with the production of leafy vegetables. The aim of this research was to evaluate an aquaponics system as an alternative for sustainable production and rational use of water in agriculture. A greenhouse with a 100 m2 wooden structure was built in this area, where the intensive rearing system with recirculation was installed, consisting of 10 tanks for fish farming and hydroponics. A total of 851 Nile juvenile tilapias with a mean weight of 23 g were housed, resulting in an approximate average density of 170 fish per cubic meter of tank. The water used in fish farming tanks was undergoing a recirculation process with a filter system to remove solid waste and ammonia. The decanted solid waste was transformed into a biofertilizer by biodigestion anaerobic process were used as nutrient solution in a hydroponic system for the cultivation of lettuce and arugula, mounted in parallel to the intensive system, which promoted irrigation and water treatment, allowing its reuse in fish creation tanks. The species created was the Nile tilapia, Gift lineage. The results demonstrated the viability of the production of fish consorted to vegetables in protected environment and a more sustainable way of using water through its recirculation, treatment and reuse.
Keywords: hydroponic, Oreochromis niloticus, reuse, intensive system, fish farming