Although there was an increase in serum protein, the increased levels of ALT and AST suggests protein catabolism at hing protein levels in the diet. the amino acids surplus from protein-rich diets cannot be directly stored in fish and they might be deaminated and converted into energetic compounds ( Ballantyne,2001; Stone et al., 2003).In this study, the rise of plasma protein with dietary protein could likely be to the enhancement of digested protein(Lundstedt et al., 2002). Increased glucose in serum suggests gluconeogenes is as a consequence to increased dietary protein level. Serum lipids slightly increased due to the increase in protein level and it may bd because the muscle is a pivotal compartment directly linked to amino acid turnover. This involves protein synthesis or breakdown of those molecules as energetic substrates.