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      Optimal amounts of coconut oil in diets improve the growth, antioxidant capacity and lipid metabolism of large yellow croaker ( Larimichthys crocea)

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          Abstract

          The purpose of this study was to investigate the effect of different dietary coconut oil (CO) levels on growth, antioxidant capacity and lipid metabolism of juvenile large yellow croaker ( Larimichthys crocea). Five iso-nitrogen (45% crude protein) and iso-lipid (13% crude lipid) experimental diets were prepared by replacing 0% (the control), 25%, 50%, 75% and 100% fish oil with coconut oil. The results showed that dietary CO had no significant effect on survival rate (SR, P > 0.05). However, the specific growth rate was increased significantly when compared with the control group when fish were fed the diet with 50% CO ( P < 0.05). The saturated fatty acids were increased significantly with increasing dietary CO in the liver and muscle, whereas the content of n-3 PUFA was decreased significantly ( P < 0.05). The highest activities of glutathione peroxidase and superoxide dismutase in the liver were recorded in fish-fed diet with 50% CO; conversely, the content of malondialdehyde was significantly decreased ( P < 0.05). The mRNA expression of peroxisome proliferator-activated receptor α, carnitine palmitoyl transferase 1 and acyl-CoA oxidase reached the highest levels in fish-fed diet with 50% CO. To some extent, this indicated that the rapid oxidation reaction of fatty acids to provide energy may be the reason for the rapid growth of large yellow croaker. In conclusion, fish-fed diet with 50% CO increased the growth rate and antioxidant capacity. Therefore, the optimal replacement level of CO to FO in the diet should be 50%.

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          Author and article information

          Journal
          MLST
          Marine Life Science & Technology
          Springer (China )
          2096-6490
          2662-1746
          01 November 2020
          13 August 2020
          : 2
          : 4
          : 376-385
          Affiliations
          1Key Laboratory of Aquaculture Nutrition and Feed, Ministry of Agriculture and Rural Affairs, and Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China
          2Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
          Author notes
          *Corresponding author: Qinghui Ai, E-mail: qhai@ 123456ouc.edu.cn
          Article
          s42995-020-00045-z
          10.1007/s42995-020-00045-z
          © 2020 Ocean University of China
          Product
          Self URI (journal-page): https://www.springer.com/journal/42995
          Categories
          Research Paper

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