Liver antioxidant status of common carp fed experimental diets. Notes, MDA, malondialdehyde; T-SOD, total superoxide dismutase; CAT, catalase; GPx, glutathione peroxidase; GSH, glutathione. Control, the control diet; HF, the high-fat diet; NaBT, the high-fat diet added with 0.1% sodium butyrate. Bars marked with different letters are significantly different (P<0.05).