김(Porphyra yezoensis)에서 추출한 당단백질의 사료내 첨가가 넙치(Paralichthys olivaceus) 치어 성장 및 Edwardsiella tarda 저항성에 미치는 영향
Effect of Dietary Glycoprotein Extracted from Porphyra yezoensis on Growth Performance and Resistance against Edwardsiella tarda in Olive Flounder Paralichthys olivaceus Juveniles
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초록
This study examined the effects of dietary glycoprotein extracted from Porphyra yezoensi on growth performance and resistance against the pathogenic bacteria Edwardsiella tarda in olive f lounder. A porphyra-originated glycoprotein (P) was extracted using sequential processes of water and ethanol treatment. P extracts were added to a f ishmeal-based diet at concentrations of 0.0, 0.5, and 1.0% (designated as Con, P0.5, and P1.0, respectively). Fish were fed one of the three experimental diets for 10 weeks. All f ish groups exhibited over 96.7% survival during the experimental period. Results indicated that the f ish fed diets containing P showed an increase in growth performance, including enhanced weight gain, specif ic growth rate, and feed eff iciency. An increase in insulin-like growth factor (IGF-1) was observed in the f ish fed the P1.0 diet, as compared to those fed Con. At the end of the 10-week feeding trial, all f ish were infected with E. tarda, and accumulated mortality was monitored for 8 days. Fish fed the Con diet exhibited increasing mortality from day 3 to the end of the challenge test, whereas the mortality of P-fed f ish ceased at day 5. We suggest that supplementation with P-originated glycoprotein in aquafeed may increase growth performance and resistance against pathogenic bacteria in olive f lounder juveniles.
Abstract
This study examined the effects of dietary glycoprotein extracted from Porphyra yezoensi on growth performance and resistance against the pathogenic bacteria Edwardsiella tarda in olive f lounder. A porphyra-originated glycoprotein (P) was extracted using sequential processes of water and ethanol treatment. P extracts were added to a f ishmeal-based diet at concentrations of 0.0, 0.5, and 1.0% (designated as Con, P0.5, and P1.0, respectively). Fish were fed one of the three experimental diets for 10 weeks. All f ish groups exhibited over 96.7% survival during the experimental period. Results indicated that the f ish fed diets containing P showed an increase in growth performance, including enhanced weight gain, specif ic growth rate, and feed eff iciency. An increase in insulin-like growth factor (IGF-1) was observed in the f ish fed the P1.0 diet, as compared to those fed Con. At the end of the 10-week feeding trial, all f ish were infected with E. tarda, and accumulated mortality was monitored for 8 days. Fish fed the Con diet exhibited increasing mortality from day 3 to the end of the challenge test, whereas the mortality of P-fed f ish ceased at day 5. We suggest that supplementation with P-originated glycoprotein in aquafeed may increase growth performance and resistance against pathogenic bacteria in olive f lounder juveniles.
참고문헌 (24)
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