Saleh, N., A. Wassef, E., M. Shalaby, S. (2018). The role of dietary astaxanthin in European sea bass (Dicentrarchus labrax) growth, immunity, antioxidant competence and stress tolerance. Egyptian Journal of Aquatic Biology and Fisheries, 22(5 (Special Issue)), 189-200. doi: 10.21608/ejabf.2018.21044
Norhan Saleh; Elham A. Wassef; Shymaa M. Shalaby. "The role of dietary astaxanthin in European sea bass (Dicentrarchus labrax) growth, immunity, antioxidant competence and stress tolerance". Egyptian Journal of Aquatic Biology and Fisheries, 22, 5 (Special Issue), 2018, 189-200. doi: 10.21608/ejabf.2018.21044
Saleh, N., A. Wassef, E., M. Shalaby, S. (2018). 'The role of dietary astaxanthin in European sea bass (Dicentrarchus labrax) growth, immunity, antioxidant competence and stress tolerance', Egyptian Journal of Aquatic Biology and Fisheries, 22(5 (Special Issue)), pp. 189-200. doi: 10.21608/ejabf.2018.21044
Saleh, N., A. Wassef, E., M. Shalaby, S. The role of dietary astaxanthin in European sea bass (Dicentrarchus labrax) growth, immunity, antioxidant competence and stress tolerance. Egyptian Journal of Aquatic Biology and Fisheries, 2018; 22(5 (Special Issue)): 189-200. doi: 10.21608/ejabf.2018.21044
The role of dietary astaxanthin in European sea bass (Dicentrarchus labrax) growth, immunity, antioxidant competence and stress tolerance
1fish nutrition, national institute of oceanography and fisheries, Alexandria, Egypt
2Fish Nutrition Laboratory, Aquaculture Department, National Institute of Oceanography and Fisheries (NIOF), Alexandria, Egypt
3Aquaculture Department, Faculty of Fish Resources, Suez University, Suez, Egypt
Abstract
European sea bass (Dicentrarchus labrax) fingerlings (0.4 ± 0.05 g initial weight) were fed on 4 diets contain 0, 60, 80 and 100 mg axtaxanthin /kg diet for 60 days. Results showed marked enhancement in fish growth, feed utilization efficiency, survival rate and fish protein content when 100 mg astaxanthin was supplemented in fish diet. The activities of hepatic antioxidation enzymes; superoxide dismutase (SOD) and glutathione peroxidase (GPx) have reduced as the level of dietary astaxanthin increased. Results showed simultaneous gradual increase in intestinal mucosal phagocytic and lysozyme activities as astaxanthin inclusion level elevates in diets indicating effective role of astaxantin as an immunostimulant agent in sea bass diet. By the end of the trial, fish were exposed to a sudden drop in water salinity (37 to 0.3‰) and that continued for 24 hours period. Survival rate was significantly the highest in fish that consumed 100mg/kg diet and when compared with control group an increment of 36.9% was recorded suggesting an improvement in fish tolerance against osmotic stress. Results demonstrate that astaxanthin is a qualified feed additive for sea bass.
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