The Recirculating Aquaculture System (RAS) effectively integrates agriculture and aquaculture but faces challenges in selecting suitable plant species for treating wastewater in brackish environments. This study evaluates Sesuvium portulacastrum L. for its potential to improve water quality and nutrient cycling in a batch and aquaponic system (four-tank system) which included tanks for Whiteleg shrimp, tilapia fish and wastewater recovery. Results showed that 1g of S. portulacastrum processed 0.397 mg NH4+, 0.030 mg NO2-, 5.276 mg NO3- and 2.477 mg total phosphorus. Shrimp weight increased from 4.6g to 16.5g, while tilapia weight increased from 30g to 67g. Key water parameters remained stable in the S. portulacastrum model compared to the control. This improved RAS model demonstrates an energy-efficient and effective solution for water and nutrient cycling, applicable in both small-scale urban and large-scale aquaculture systems.