1 Aquatic Science and Fish Resources http://asfr.journals.ekb.eg 4108 - 4086 Online ISSN: 2682 - Print ISSN: 2682 Performance of Red Tilapia Hybrid and Mint under Different Density Low Saline Integrated Aquaponic Systems Aya A. Khodary 1 , M. F. Osman 1 , M. A. Amer 1 , M. M. Said 2 1 Department of Animal Production, Faculty of Agriculture, Ain Shams University, Egypt. 2 Department of Aquaculture, Faculty of Fish Resources, Suez University. Egypt. ARTICLE INFO ABSTRACT Article history: Received Dec. 13, 2022 Received in revised form JAN. 17, 2023 Accepted JAN. 17, 2023 Available online JAN. 19, 2023 This study determined how stocking density affected water quality, red tilapia performance, proximate body composition, and mint performance in low-saline aquaponic systems. Experimental systems were stocked with 40 fish / m3 (low density: LD) and 60 fish/ m3 (high density: HD), three replicates each. The experiment lasted for 120 days. Dissolved Oxygen (mg/l) was significantly higher in LD treatment. Water pH decreased significantly (P<0.05) with increasing stocking density. Both Ammonia nor Nitrite did not affect significantly. Weight gain and specific growth rate% were significantly higher in the LD group, 150.33 ±8.95 and 1.65 ±0.006, respectively, as compared with 122.0 ± 3.46 and1.48 ± 0.005 for HD. The survival rate% was 92.5%±1.25 and 88.33%±0.98 for LD and HD, respectively. Total fish biomass in HD units (8.78 Kg. ± 0.24) was significantly higher than in LD (7.18 Kg. ± 0.37). The feed conversion ratio was significantly reduced with increasing stocking density, whereas the protein efficiency ratio increased with stocking density. Individual plant fresh weight, length, and a number of leaves did not differ significantly with fish density. Root length significantly declined with fish density increasing 60.21±4.79 and 41.18 ± 4.20 cm, respectively. The fish body content of moisture, protein, and ash did not differ significantly with stocking density. Significantly lower fish body fat content was found in the HD group Keywords Aquaponics Low saline Water quality Growth performance Plant performance Body composition 1. INTRODUCTION More stresses on the natural resources including land, water and nutrients become ever greater than before. There is an important need to find alternative, sustainable and reliable systems to provide food (Goddek et al., 2019). * Corresponding author. M. M. Said E-mail addresses: msaid226@yahoo.com doi: 10.21608/asfr.2022.180624.1030 Aquaculture intensification is critical for food safety and security to meet the dramatically increase in the world population (Tidwell, 2012). Keeping of desirable water quality profile for high growth performance of fish remains a noteworthy challenge for aquaculture scientists (Rakocy et al., 2006; FAO, 2018).Optimization of growth conditions for both fish and plants is the biggest challenge