Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Preliminary Studies on the Effects of Dietary Genetically Modified Soya and Corn on Growth Performance and Body Composition of Juvenile Olive Flounder(Paralichthys olivaceus) and Rockfish (Sebastes schlegeli)

  • Pham, Minh Anh (Faculty of Marine Bioscience and Technology, Gangneung-Wonju National University) ;
  • Nam, Yoon-Kwon (Institute of Marine Living Modified Organisms, Pukyong National University) ;
  • Kim, Sung-Hwean (Institute of Marine Living Modified Organisms, Pukyong National University) ;
  • Kim, Dong-Soo (Institute of Marine Living Modified Organisms, Pukyong National University) ;
  • Cho, Sung-Hwoan (Division of Ocean Science, College of Ocean Science & Technology, Korea Maritime University) ;
  • Kim, Bong-Seok (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Lee, Sang-Min (Faculty of Marine Bioscience and Technology, Gangneung-Wonju National University)
  • Received : 2009.12.22
  • Accepted : 2010.03.12
  • Published : 2010.03.31
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Abstract

Two feeding experiments were conducted to investigate the effects of dietary genetically modified (GM) soya and com on growth performance, feed utilization and body composition of juvenile olive flounder, Paralichthys olivaceus and rockfish, Sebastes schlegelii. For each fish species, four isonitrogenous (50% crude protein) and isocaloric (4.1 kcal/g) diets (designated as nGM soya, GM soya, nGM com and GM com) were formulated to contain 20% non-GM (nGM) and GM soya and com. Thirty olive flounder (initial body weight, 15.4${\pm}$0.4 g) and fifty rockfish (initial body weight, 3.1${\pm}$0.02 g) were distributed in each 400 L tank (200 L water) in a flow through system. Each experimental diet was fed to triplicate groups of fish to visual satiation, twice a day (9:00 hand 17:00 h) for 6 weeks. Growth performance was measured every three weeks. No effects of GM feedstuffs on survival were observed. Dietary inclusion of GM feedstuffs did not affect growth performance and feed utilization of fishes, except for rockfish fed GM com. Rockfish fed the GM com diet showed higher weight gain, daily feed intake and daily protein intake than did fish fed the nGM com diet, but no significant differences were observed in final body weight between the dietary treatments. Condition factor, hepatosomatic index, visceral somatic index and body composition were not altered by the inclusion of GM feedstuffs. These results indicate that dietary inclusion of GM soya and com could have no effects on growth performance and feed utilization of juvenile flounder and rockfish. Lower weight gain and feed intake in flounder and rockfish fed the diets containing 20% soya were likely due to anti-nutritional factors, rather than transgenic factors in the feedstuffs. Dietary inclusion of GM soya and com at the level tested did not alter the body composition of fishes. Further studies to investigate the effects of GM feedstuffs on health conditions and the development of fishes, as well as those of residue of transgenic fragments in ambient environments and in animals are necessary for safe use of the ingredients in aquaculture.

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