Choline Essentiality and Its Requirement in Diets for Juvenile Parrot Fish (Oplegnathus fasciatus)

  • Khosravi, Sanaz ;
  • Jang, Ji-Woong ;
  • Rahimnejad, Samad ;
  • Song, Jin-Woo ;
  • Lee, Kyeong-Jun
  • Received : 2014.07.17
  • Accepted : 2014.11.23
  • Published : 2015.05.01


A 12-wk feeding trial was conducted to evaluate the essentiality of choline supplementation in diets for parrot fish. Five isonitrogenous and isocaloric diets were supplemented with 0 (as control), 500, 1,000, and 2,000 mg choline per kg diet, and a positive control diet without choline contained 0.3% of 2-amino-2-methyl-1-propanol as choline biosynthesis inhibitor (designated as Con, C500, C1000, C2000 and $Con^+$, respectively). Triplicate groups of fish (body weight, $8.8{\pm}0.01g$) were fed one of the experimental diets at a rate of 4% body weight twice daily. The fish fed $Con^+$ diet revealed significantly lower growth performance and feed utilization efficiency than other fish groups. Supplementation of choline to the basal diet did not significantly influence fish growth. The highest liver lipid content was observed in fish fed the $Con^+$ diet and inversely correlated with liver choline concentration although the differences were not significant. Also, significantly higher liver linoleic, eicosapentaenoic and docosahexaenoic acid contents were found in fish fed the $Con^+$ diet. Innate immune parameters including respiratory burst and myeloperoxidase activities were not significantly affected by dietary choline levels. The findings in this study conclude that choline concentration of approximately $230mgkg^{-1}$ diet meets the requirement of parrot fish.


Choline;Parrot Fish;Oplegnathus fasciatus;Growth Performance;Requirement


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Supported by : National Research Foundation of Korea (NRF)