The Effects of Adding Cinnamon Powder (Cinnamomum verum) on Some Blood and Growth Factors in the Rainbow Trout (Oncorhynchus mykiss) Juvenile

This study aimed to determine different dose effects of cinnamon (Cinnamomum verum) powder on some blood and growth factors in the rainbow trout (Oncorhynchus mykiss) which investigated for eight weeks. For this purpose, 750 fish were examined with the mean weight of 20±5 g in a completely randomized design with five treatments and three repeats for each treatment. The fish were daily fed by 3% body weight with a diet containing 0, 1, 3, 6, and 12 g of cinnamon powder per 1 kg of feed. Growth factors were measured every two weeks, and hematological parameters were measured at the end of 8th week due to the standard laboratory measures on peduncle blood. Maximum weight, total length, specific growth rate, and optimal feed conversion ratio belonged to the feed containing 12 g of cinnamon (p < 0.05). Regarding the blood factors, no significant difference existed between various treatments and control group, while the maximum number of leukocytes and highest percentage of lymphocyte were observed in the treatment containing 12 g of cinnamon powder (p < 0.05). In general, it can be concluded that cinnamon powder stimulates growth, enhances the immune system, prevents the diseases, and promotes the resistance in the rainbow trout juvenile.