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Development of Extruded Pellet for Growth of Flounder (Paralichthys olivaceus) in Commercial Scale Feeding Trials  

Seo, Joo-Young (Faculty of Marine Bioscience and Technology, Kangnung National University)
Choi, Jin (Faculty of Marine Bioscience and Technology, Kangnung National University)
Lee, Jong-Ha (Eastsea Mariculture Research Institute, National Fisheries Research and Development Institute)
Lee, Sang-Min (Faculty of Marine Bioscience and Technology, Kangnung National University)
Publication Information
Journal of Aquaculture / v.20, no.2, 2007 , pp. 114-120 More about this Journal
Abstract
Two feeding experiments were conducted to evaluate the effects of the experimental extruded pellet (EP), commercial EP and raw fish-based moist pellet (MP) on growth of growing flounder (Paralichthys olivaceus). In experiment 1, two replicate groups of the fish (average body weight of $115{\pm}3.2\;g$) were fed one of five experimental diets (EP1-EP5) and MP in circular concrete tanks (4.6 m $\phi$, 0.6 m depth) for 78 days. In experiment 2, in order to evaluate EP in the commercial scale ($8\;m\;{\times}\;8\;m$), flounder (average body weight of $137{\pm}11.4\;g$) were fed one of five EPs (EP1-EP5) used in experiment 1, commercial EP (EP6) and two MEPs (MEP4 and MEP6) as moist pellet types which were made from EP4 and EP6, respectively, by being sprayed with a mixture of water and additives for 80 days. In experiment 1, weight gain of fish fed the all EPs was not significantly different from that of MP. Feed efficiency of fish fed the EP4 was highest, and protein efficiency ratio of fish fed the EP4 and EP5 was significantly higher than that of fish fed the MP (P<0.05). Significant differences were observed in the contents of moisture and crude lipid in the muscle, and moisture in the liver of fish (P<0.05). In experiment 2, weight gain of fish fed the EP4 and MEP4 were highest and feed efficiency showed high tendency in EP4, MEP4 and MEP6. Fish fed the MEP6 showed higher weight gain and feed efficiency compared to those of fish fed the EP6, but there was no difference in those of fish fed EP4 and MEP4. Based on the results of this study, dietary formulations used in EPs could be most recommendable applied in the practical extruded pellet feeds for flounder grown from 114 g to 350 g.
Keywords
Extruded pellet; Fish-based moist pellet; Flounder; Growth;
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Times Cited By KSCI : 8  (Citation Analysis)
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