Improvement in physiological potency of common carp fed with Shirazi thyme and vitamin E as complementary feed additives

The aims of the present study were to evaluate the effects of Shirazi thyme and vitamin E as complementary additives on stress recovery of common carp juveniles that were exposed to cadmium. 135 juveniles (34±3g) were divided into three groups. The first (control) and the second (non-feed additive) group fed with the standard diet for common carp and the third group (complementary) fed with the diet containing 1 percent Shirazi thyme and vitamine E (100 mg/Kg dry weight of diet). All of the experimental groups (except the control group) were challenged with sublethal concentration of cadmium (1.5 mg/L). Then, plasma enzymes and biochemical parameters were evaluated at 0, 7 and 15 days after cadmium exposure. Cadmium exposure led to significant increase in the amounts of AST, ALT, LDH, ALP, triglyceride, cholesterol, glucose and creatinine in the non-feed additive group, whereas the amounts of plasma enzymes and biochemical parameters in the complementary group were not changed after cadmium exposure as compared to those of the control group (p>0.05). In conclusion, using Shirazi thyme and vitamin E led to improvement in stress responses of common carp against waterborne cadmium.