|Influence of dietary carbohydrate on antioxidant enzyme activities in liver of Atlantic salmon (Salmo salar L.)|
Lygren, B.; Hemre, G.-I. (2001). Influence of dietary carbohydrate on antioxidant enzyme activities in liver of Atlantic salmon (Salmo salar L.). Aquacult. Int. 9(5): 421-427
In: Aquaculture International. Springer: London. ISSN 0967-6120, more
Antioxidants; Atlantic salmon; Carbohydrates; Enzymes; Peroxidation; Marine
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Effects of dietary carbohydrates on hepatic antioxidant enzyme activities were studied in Atlantic salmon (Salmo salar L.), fed diets containing no additional carbohydrate, or a low (15% addition) or high (30% addition) concentration of D-glucose or gelatinised potato starch. Addition of free glucose to the feeds resulted in glucose availability being 7 and 18% when added at 15 and 30%, while the addition of gelatinised starch did not seem to reduce starch availability. The dietary treatment groups (no carbohydrate, 7 and 18% glucose or 15 and 30% gelatinised starch) were provided with quantities of feed that supplied the same amounts of protein and lipid. There was a positive correlation between tiobarbituric acid-reactive substances (TBARS) in feeds and salmon liver. Liver glycogen concentrations increased with increasing dietary glucose and starch, and the two higher levels of liver glycogen, found in groups G18 and S30, resulted in decreased activities of catalase, superoxide dismutase (t-SOD), and concentrations of glutathione. This indicates that there are links between carbohydrate metabolism and antioxidant systems in salmon liver. There was no correlation between selenium dependent glutathione peroxidase (Se-GPX) activity and dietary carbohydrate concentrations, but Se-GPX activity increased in response to increased TBARS. Catalase and t-SOD activities did not correlate with either TBARS values or Se-GPX activity.