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

Authors : Metin YAZICI, Yavuz MAZLUM, Mehmet NAZ, Çiğdem ÜRKÜ, Musa TÜRKMEN, Tülay AKAYLI

Pages : 195-204

Doi:10.26650/ASE20221101489

View : 16 | Download : 13

Publication Date : 2022-10-20

Article Type : Research Paper

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