Comparative effect of the oral prescription of Shirazi thyme (Zataria multiflora Boiss) and vitamin E on growth indices of juvenile common carp (Cyprinus carpio L.)

Nowadays the herbal drugs products and their derivate are used as an immunostimulants, growth promoters and physiological booster in aquatic animals. In the current study, the comparative effects of Shirazi thyme and Vitamin E on growth and health status of common carp juveniles has been investigated. The total of 144 juveniles specimens were selected and divided into four groups and were treated during 45 days as following the first group (control) were fed based on standard diet for common carp. Second group juveniles were fed with diet containing 1 %/kg dry weight of diet Shirazi thyme, The third group were fed with excess amount of 100 milligram/Kg dry weight of diet from vitamin E and the last group were fed with combined level of Shirazi thyme and vitamin E as a same level with previous groups. Growth and health parameters were evaluated 15, 30 and 45 days since beginning of essay. There was not any negative effect of Shirazi thyme prescription on growth. There was a significant difference in indices including vicerosomatic index, weight gain (%), intestine somatic index, specific growth rate, feed conversion and protein efficiency ratio of Shirazi thyme group with control. Combined level of Shirazi thyme and vitamin E had not any synergistic effect on juvenile’s growth performance. Therefore these results confirm the positive effect of 1% Shirazi thyme on growth factors in the common carp and can be recommended for aquaculture.