Effects of Adding Laurel (Laurus nobilis) Essential Oil to the Diet of Tilapia Fish on Growth and Intestinal Histology

The effects of adding laurel oil to the experimental diet on growth performance, biochemical compositions fish and feeds, sand liver intestine histology in Nile tilapia (Oreochromis niloticus) juveniles were evaluated. 180 (12±0.02 g) used study. They randomly placed 12 tanks with a volume 500 liters, 15 per tank. commercial was added diets at 0, 0.3, 0.6, 1.2%. fed twice day as apparent satiation for 60 days. In current study, weight gain (WG), feed conversion ratio (FCR), specific rate (SGR) survival rates (SR) statistically similar (p>0.05). While no difference observed between protein ash values analysis fish, lipid found be lower 0.3% 0.6 supplemented groups compared control 1.2% groups. addition, there statistical protein, lipid, values composition feeds. essential components Laurus nobilis such Linalool, Elemene, Trans-Caryophyllene, Cis-α-Bisabolene, Α-Terpinyl Acetate, Methyleugenol, β-Eudesmol determined low levels. addition did not cause histopathological findings, it improve intestinal tissues. conclusion, is suggested that can additive culture, especially considering data obtained from histological analyzes. Further studies are deserved need examine immunity resistance various stress factors other fish.