A 120-day growth trial was completed to assess rearing water quality and fish performance in terms of growth, feed efficacy, digestive enzymes, immunity, and antioxidant activity of seabass fed an experimental diet (ED) supplemented with commercial wood charcoal (WC) and activated wood charcoal (AC). Three levels (0, 10, and 20g) of WC and AC were administered, representing five treatments: control (CD) fish-fed ED without additives, (WC-1) fish-fed ED containing 10g kg⁻¹ WC, (WC-2) fish-fed ED containing 20g kg⁻¹ WC, (AC-1) fish-fed ED containing 10g kg⁻¹ AC, and (AC-2) fish-fed ED containing 20g kg⁻¹ AC. Three hundred fish (60.120.20g/fish) were stocked in 15 cement tanks (4.0m2.0m1.2m, water volume 5m³ each) at 20 fish/tank and a daily feed ration of 3 of body weight. Results revealed significant improvements with increased growth variables (final weight, weight gain, and specific growth rate), decreased FCR, and decreased ammonia levels and heavy metals (Cu, Cd, Fe, Mn, and Zn) content in rearing water, muscle, and liver with fish fed WC and AC supplemented diets. Furthermore, considerable improvements in digestive enzymes, immunity, and antioxidant activity, with enhanced kidneys, liver, intestines, gills, and spleen. Fish fed the WC-1 diet had a higher final weight (171.90g), better FCR (1.25), and improved internal organs than the other groups.