Dietary lipid sources affect cold tolerance of Nile tilapia (Oreochromis niloticus) |
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| Institution: | 1. College of Fisheries and Life Sciences, Center for Research on Environmental Ecology and Fish Nutrition of Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China;2. Shanghai Engineering Research Center of Aquaculture, Shanghai 201306, China;3. National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China;4. University for Development Studies, Faculty of Natural Resources and Environment, Department of Fisheries and Aquatic Resources Management, Tamale, Ghana;5. University of Energy and Natural Resources, School of Natural Resources, Department of Fisheries and Water Resources, Sunyani, Ghana;1. INRA, Univ Pau & Pays de l''Adour, UMR1419 Nutrition Metabolism and Aquaculture, Aquapôle, F-64310 Saint-Pée-sur-Nivelle, France;2. Suranaree University of Technology, School of Animal Production Technology, Institute of Agricultural Technology, 111 University Avenue, Muang, Nakhon Ratchasima, 30000, Thailand;1. Çukurova University, Faculty of Fisheries, Department of Aquaculture, 01330 Adana, Turkey;2. Kafrelsheikh University, Faculty of Veterinary Medicine, Department of Nutrition and Clinical Nutrition, 33516 Kafrelsheikh, Egypt;3. Akdeniz University, Faculty of Science, Department of Biology, Antalya, Turkey;4. Deakin University, School of Life and Environmental Sciences, Locked Bag 20000, Geelong, VIC 3220, Australia;5. The Mediterranean Fisheries research, Production and Education Institute, Antalya, Turkey;6. Akdeniz University, Faculty of Education, Department of Science Education, Antalya, Turkey |
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| Abstract: | This study was carried out to evaluate the effects of dietary lipid sources on growth performance, fatty acids composition and cold tolerance of Nile tilapia (Oreochromis niloticus) fingerlings (7.00 ± 0.50 g/fish). The fish were fed four isonitrogenous (28% crude protein), isocaloric (500 kcal/100 g) diets containing four lipid sources; fish oil (FO), corn oil (CO), coconut oil (COCO) or fish oil/ corn oil mixture (1:1 ratio) (oil mix). The diets were offered to the fish at a daily rate of 3% of their body weights (BW), twice a day for two months. After the feeding trial, the fish were exposed to decreasing water temperature from 25 °C until the appearance of death symptoms. The results revealed that FO-based diets (FO and oil mix) produced the best growth rates and feed efficiency, followed by corn oil diet, while COCO resulted in the lowest performance. Fish fed on CO and oil mix showed higher body unsaturated fatty acids (UFA) and lower lethal temperature than those fed on FO- or COCO-based diets. These results indicate that cold shock can modify the lipid metabolism in Nile tilapia by lowering total body saturated fatty acids and raising n-6 and n-3 UFA. This finding suggests that the inclusion of high levels of plant oils in Nile tilapia feeds can enhance their cold tolerance. |
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| Keywords: | Nile tilapia Growth Fatty acids Cold tolerance Oil sources |
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