their relatively lower protein contents and unbalanced essentialamino acid profiles. Despite the recommended maximum dietaryinclusion levels of 15% for copra and palm kernel meals in fish diets(Jauncey, 1998; Hertrampf and Piedad-Pascual, 2000), some stud-ies have demonstrated the possibility of including higher levels ofthese byproducts in tilapia diets without negatively affecting feedintake and growth performance. Copra inclusion levels beyond 30%significantly reduced feed conversion efficiencies of Nile tilapia(Santos et al., 2009)