• 한국양식학회지
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• 제10권2호
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• pp.163-169
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• 1997

사료물성과 단백질원 배합비에 따른 조피볼락의 성장차이를 구명하기 위하여, 실험사료의 단백질원을 북양어분과 갈색어분으로 한 사료와 경제적인 측면을 고려하여 어분의 배합 비율을 낮추는 대신, 대두박, 콘글루텐 밀, 육분 및 우모분의 비율을 늘린 2종의 사료를 설계하여, 각각 EP(extruded-floating pellet, 부상사료), SP(slow-sinking pellet, 반부상사료), FP(fast-sinking pellet, 침강사료)와 MP (moist pellet, 습사료) 형태의 배합사료를 제조하였다. 평균체중 75 g의 조피볼락을 각 수조에 50마리씩 수용하여 $2(diet\times)4(diet type)\times3(replication)$ factorial design으로 15주간 사육하였다. 사육 실험한 결과, 실험사료와 사료형태에 따른 최종평균체중, 증체율, 사료효율, 사료 섭취율, 단백질 효율, 간중량비 및 내장중량비는 전혀 차이가 없는 것으로 나타났다(P>0.05). 실험 종료시의 실험 구별, 어체 부위별 일반성분 중에 사료별, 사료 형태별로 모두 간과 근육의 단백질 및 근육의 수분과 지질 함량은 실험구간별로 유의적인 차이가 없었다(P>0.05). 위와 같이 사료의 물성이나 침강 속도는 조피볼락의 성장, 영양소 이용효율, 사료 섭취율 및 체성분에 영향을 미치지 않은 것으로 나타나, 양식 현장에서 사료 형태에 관계없이 적절히 선택하여 사용할 수 있을 것으로 전망된다.

• 한국수산과학회지
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• 제52권5호
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• pp.468-473
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• 2019

A $2{\times}4$ factorial feeding trial was conducted to examine the effect of feed type and feeding frequency on the performance of sub-adult starry flounder Platichthys stellatus. Two feed types, sinking pellets (SP) and floating pellets (FP), were given to 480 fish housed in tanks. Triplicate groups of fish were fed each feed type at one of four feeding frequencies (one meal every two days, one meal per day, two meals per day, and three meals per day) for nine weeks. Weight gain (WG) and specific growth rate (SGR) of fish were affected by feeding frequency. However, WG and SGR were the same in fish fed SP at two and three meals per day; similarly, there was no difference in WG or SGR of fish fed FP at one meal, two meals, or three meals per day. Feed utilization of fish was affected by both feed type and feeding frequency. These findings suggest that two meals per day of the SP or one meal per day of FP are sufficient for optimum growth performance of sub-adult starry flounder.

• 한국수산과학회지
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• 제38권5호
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• pp.291-297
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• 2005

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.