Comparing the Effects of Feeding a Fish Oil- or a Cod Liver Oil -Based Diet on Growth, Feed Utilization and Muscle Fatty Acid Composition Nile Tilapia (Oreochromis niloticus)

Authors : Arzu ÖZLÜER HUNT, Ferbal ÖZKAN YILMAZ, Zeynep ERÇEN

Pages : 130-142

Doi:/medfar.v1i39443.440518

View : 18 | Download : 7

Publication Date : 2018-09-28

Article Type : Research Paper

Abstract :The present study was performed to investigate the influence of fish oil  insert ignore into journalissuearticles values(FO); and cod liver oil insert ignore into journalissuearticles values(CLO); as the dietary lipid sources on the growth performance, feed utilization and fatty acid insert ignore into journalissuearticles values(FA); composition of  Oreochromis niloticus . two isonitrogenous insert ignore into journalissuearticles values(38% crude protein);, isocaloric insert ignore into journalissuearticles values(18.9 MJ GE/kg); diets containing 6% of added fat from the lipid sources were formulated and used. Each diet was fed to triplicate groups of 17 fish of 18.18 ± 0.02 g mean initial body weight fed with %3 body weight two times a daily. The tilapia was raised at          28±1 °C in 6 square experimental cages insert ignore into journalissuearticles values(1×1×1.25 m); during the 60 days. Results showed that the source of added lipid significantly influence insert ignore into journalissuearticles values( P <0.05); final body weight, live body weight and daily growth rate but did not affect specific growth rate, feed conversion ratio and survival, rate of tilapia. There was no significant difference in the fillet proximate composition of fish fed the FO or CLO diets, except for fish fed the CLO diet showed lower lipid deposition insert ignore into journalissuearticles values( P <0.05);. The deposition of fatty acids in fish tissues was generally influenced by the fatty acid profile of the diets. Fillet fatty acid profiles of tilapia fed CLO-based diet had significantly higher concentrations of saturated and monounsaturated fatty acids, but lower levels of polyunsaturated fatty acids insert ignore into journalissuearticles values(PUFA); compared to the fish fed the FO diet. Fillet of fish fed the FO diet had significantly higher concentrations of DHA insert ignore into journalissuearticles values(docosahexaenoic acid); compared with fish fed CLO-based diets insert ignore into journalissuearticles values( P <0.05);. EPA insert ignore into journalissuearticles values(eicosapentaenoic acid); did not showed significantly different both diet insert ignore into journalissuearticles values( P >0.05);. In fish fed FO diet group, both  n −3 and  n −6 PUFA were the highest when compared with fish fed with CLO diet. The lipid source not influenced insert ignore into journalissuearticles values( P <0.05); hepatosomatic index insert ignore into journalissuearticles values(HSI); and viscerosomatic index insert ignore into journalissuearticles values(VSI);. However, fish fed CLO contained diet showed significantly higher liver fat insert ignore into journalissuearticles values(20.20±0.22); than fish fed FO diet group insert ignore into journalissuearticles values(13.88±0.22); insert ignore into journalissuearticles values( P <0.001);.
Keywords : Cod liver oil, Fatty acid composition, Fish oil, Growth oil, EPA DHA, Oreochromis niloticus