Effects of green tea (Camellia sinensis) ethanolic extract on biochemical parameters and oxidative status in goldfish (Carassius auratus)

In this study, effects of ethanolic green tea (Camellia sinensis) extract on some biochemical and antioxiant parameters in gold fish (Carassius auratus) were evaluated. The fish (average mean weight 9.1 ± 0.5 grams) were randomly distributed at density of 90 fish in nine tanks )with three tanks for each group(. In treatment groups, fish fed ethanolic green tea extract at 50 and 100 mg kg-1 for a period of two months where as in control group, basal diet without any additive was used. Results showed that total protein increased in both treatment groups. Serum metabolic enzymes including alkaline phosphatase (ALP) and aspartate aminotransferase (AST) did not change between different groups. On the other hand, lipid peroxidation product decreased in both treatment groups. Similarly, antioxidant enzyme activity of superoxide dismutase (SOD) increased following the administration of green tea in both groups compared to the control group. Under the present experimental condition, the optimal supplementary level of ethanolic green tea extract was 50 mg kg-1 with potential to positively influence some biochemical parameters and antioxidant status in gold fish.