Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Quality Evaluation of Commercial Extruded Pellet Diet for Olive Flounder, Paralichtys olivaceus

시판 넙치용 배합사료의 품질평가

  • JI Seung Cheol (Fisheries Laboratory, Kinki University) ;
  • MOON Gyeong Su (Woo Sung Feed Co., LTD.,) ;
  • YOO Jin Huyng (Division of Aqua Life Science, Yosu National University) ;
  • LEE Si Woo (Division of Aqua Life Science, Yosu National University) ;
  • KIM Hong Beom (Division of Aqua Life Science, Yosu National University) ;
  • JEONG Gwan Sik (Division of Aqua Life Science, Yosu National University)
  • 지승철 (긴키대학 수산연구소) ;
  • 문경수 (㈜우성사료) ;
  • 유진형 (여수대학교 수산생명과학부) ;
  • 이시우 (여수대학교 수산생명과학부) ;
  • 김홍범 (여수대학교 수산생명과학부) ;
  • 정관식 (여수대학교 수산생명과학부)
  • Published : 2005.10.01
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Abstract

This study evaluated the quality of commercial extruded pellet (EP) diet of five companies (A, B, C, D and E) for olive flounder Paralichtys olivaceus by biochemical analyses, physical properties and growth performance. The proximate analyses of five EP diets showed $3.2-10.0\%$ of moisture, $49.3-55.5\%$ of crude protein, $4.6-14.7\%$ of crude lipid, $7.0-13.8\%$ of crude ash, $0.7-10.5\%$ of crude fiber, $10.0-27.3\%$ of itrogen free extract (NFE), 304.3-395.4kcal/100g of digestible energy (DE) and 6.1-7.1 of calorie/protein ratio (C/P). Peroxide value (POV) was highest in diet D (47.4 meq/kg) as compared to other diets which in the range of 4.0-11.7 meq/kg. Total amino acid contents were ranged from 46.54 to $55.46\%$ with the highest content in diet B and the lowest content in diet C. Essential amino acid of diet C was lowest $(7.43\%)$ as compared to other diets which in the range of $19.43-20.30\%$. Saturated fatty acid was higher in diet A $(37.65\%)$ followed by diet B $(36.32\%)$, diet E$(34.39\%)$, diet C$(30.95\%)$ and diet D$(30.10\%)$. EPA+DHA were highest in diet E$(30.78\%)$ and lowest in diet C$(15.48\%)$. The floating rate after 6 hours on the sea water was highest in diet C$(100\%)$ followed by diet B$(40\%)$ and A$(10\%)$. However, diets D and E were completely settled down after 1 and 2 hours, respectively. The range of relative expansion rate was $27.2-49.3\%$ for all diets and all reached the peak at 2-3 hours. The water absorption rate of diets C and D was lowest, and diet E was highest at 1 hour after deposition of sea water. Growth rate was higher in diet B$(22.3\%)$ and E$(21.3\%)$. Feed efficiency was higher in diet A$(109.7\%)$ and E$(105.3\%)$ and was significantly lowest in diet D$(80.7\%)$. The protein efficiency ratio was highest in diet E (2.72) and lowest in diet D (1.76). These results suggest that there is a necessity for improvement of nutrients balance and feed physical properties to fulfill the nutrient requirements and digestive characteristics of fishes in commercial EP diets.

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References

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