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Effects of Dietary Supplementation of Scoria on Growth and Protein Digestibility in Juvenile Parrot Fish Oplegnathus fasciatus and Olive Flounder Paralichthys olivaceus  

Ko, Gyung-Yong (Department of Marine Life Science, Cheju National University)
Lim, Se-Jin (Department of Marine Life Science, Cheju National University)
Kim, Sung-Sam (Department of Marine Life Science, Cheju National University)
Oh, Dae-Han (Department of Marine Life Science, Cheju National University)
Lee, Kyeong-Jun (Department of Marine Life Science, Cheju National University)
Publication Information
Journal of Aquaculture / v.21, no.3, 2008 , pp. 133-138 More about this Journal
Abstract
We evaluated the effects of dietary supplementation of scoria on growth performances and apparent protein digestibility in juvenile parrot fish Oplegnathus fasciatus and olive flounder Paralichthys olivaceus. In experiment, parrot fish at initial average weight of $7.6{\pm}0.01g(mean{\pm}SD)$ were divided into 9 groups(three groups per dietary treatment) and fed one of three isonitrogenous diets which contained 0%, 1% and 2% of scoria, respectively. Experiment was conducted with juvenile olive flounder to demonstrate the improved apparent digestibility of protein found in the experiment. Five experimental diets were formulated to contain different levels of scoria: Diet 1(control), 0% scoria; diet 2, 1% scoria; diet 3, 2% scoria; diet 4, 3% scoria; and diet 5, 4% scoria. After 9 weeks of feeding trial(Exp), no significant differences were observed on growth performances between Scoria 2% and the control group. However, the growth was significantly lower in scoria 1% compared to that of the control group. Hematological parameters were not affected by the supplementation of scoria. Interestingly, apparent protein digestibility was improved by dietary supplementation of scoria both in parrot fish and olive flounder. The findings suggest that dietary supplementation of 2-3% scoria is optimum levels in order to improve the protein digestibility in the diets for juvenile parrot fish and olive flounder.
Keywords
Parrot fish Oplegnathus fasciatus; Olive flounder Paralichthys olivaceus; Scoria; Feeds; Protein digestibility;
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