Effects of dietary inclusion of Chlorella vulgaris on growth, blood biochemical parameters and antioxidant enzymes activity in olive flounder, Paralichthys olivaceus

Resumen

This study was carried out to investigate the effects of dietary inclusion ofdefatted Chlorella on growth performance, body composition, bloodbiochemistry and antioxidant enzymes activity in olive flounder. Four isonitrogenous (51% crude protein) diets were formulated to contain 0 (control), 5, 10 or 15% Chlorella meal (CM) (designated as, Con, CM5, CM10 andCM15, respectively) and fed to triplicate groups of fish (104.4 g) to apparentsatiation twice daily for 8 wk. At the end of feeding trial, significantenhancement (P <0.05) in growth performance was obtained at over 10%CM compared to fish fed the control diet. No significant changes in dorsalmuscle and liver proximate compositions were found following CMadministration. The groups fed CM containing diets revealed significantlylower plasma cholesterol concentration than those fed the control diet.Dietary CM affected antioxidant enzymes activity; significantly higherplasma catalase activity was found in fish fed 10% CM and total antioxidantcapacity increased in CM5 and CM10 groups compared to control. However,plasma glutathione peroxidase and superoxide dismutase activities werenot significantly influenced by dietary CM. Also, significant enhancement inDPPH radical scavenging activity was found in dorsal muscle of fish fedCM15 diet compared to control. The findings in this study showed that dietary inclusion of 10-15% CM can enhance growth performance, and affectantioxidant enzymes activity and lipid metabolism in olive flounder.