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조피볼락(Sebastes schlegeli) 치어의 배합사료 적정 공급률과공급횟수
이진혁 ( Jin Hyeok Lee ),김강웅 ( Kang Woong Kim ),이봉주 ( Bong Joo Lee ),박건현 ( Gun Hyun Park ),이준호 ( Jun Ho Lee ),윤현호 ( Hyeon Ho Yun ),배승철 ( Sung Chul Bai ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6
Two feeding trials were conducted to investigate the effects of feeding rate and frequency on growth performance and body composition of juvenile Korean rockfish Sebastes schlegeli reared at 15.0±0.3°C. In the first trial, three replicate fish groups averaging 2.07±0.03 g were fed a commercial diet with one of seven different daily feeding rates: 1.00%, 2.00%, 2.50%, 2.75%, 3.00%,3.25%, and satiation (3.34%) based on body weight (BW). After four weeks of feeding, fish fed the 3% diet showed significantly higher weight gain (WG) and feed efficiency (FE) than fish that received the other feeding rates. In the second trial, the optimum feeding frequency was evaluated with three replicate fish groups averaging 2.04±0.03 g. Fish were fed a commercial diet at 2.87%BW with six different daily feeding frequencies: 2, 3, 4, 5, 7, or 9 meals. After four weeks of feeding, WG, specific growth rate, FE,and protein efficiency rate in fish fed 3 meals d-1 were significantly higher than those of fish fed 7 or 9 meals d-1. In both feeding trials,proximate composition of the entire body changed depending on the feeding rate or frequency. A broken-line regression analysis based on weight gain suggested that the optimum daily feeding rate and frequency for juvenile Korean rockfish at 15°C was 2.9%BW d-1 and 2?3 meals d-1, respectively.
수온별 조피볼락(Sebastes schlegeli) 치어의배합사료 적정 공급횟수
이진혁 ( Jin Hyeok Lee ),이봉주 ( Bong Joo Lee ),김강웅 ( Kang Woong Kim ),한현섭 ( Hyon Sob Han ),박건현 ( Gun Hyun Park ),이준호 ( Jun Ho Lee ),윤현호 ( Hyeon Ho Yun ),배승철 ( Sung Chul Bai ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6
We conducted two feeding trials to investigate the optimal feeding frequency of juvenile Korean rockfish Sebastes schlegeli fed a commercial diet of expanded pellets containing 47.2% crude protein, 9.2% crude lipid, and 14.5% ash at two different water temperatures. In the first experiment, triplicate groups of 20 fish with an average weight of 2 g were fed an equal amount of diet (5.97%based on body weight) at one of six feeding frequencies (2, 3, 4, 5, 7, or 9 meals/day) for four weeks at 17.5˚C. After four weeks,we measured weight gain (WG), specific growth rate (SGR), feeding efficiency (FE), and protein efficiency ratio (PER). Fish fed diet five meals/day grew significantly better than those fed nine meals/day. The second experiment used identical experimental conditions and feeding regions, except the food ration was slightly less (5.92% based on body weight) and the water temperature was increased to 20˚C. After four weeks, we again measured WG, SGR, FE and PER. Fish fed seven meals/day grew significantly faster than those fed 2, 3, 4, or 9 meals/day. Whole-body protein levels in fish fed three meals/day was higher than those fed four meals/day in 17.5˚C water, but whole-body lipids in the fish fed four meals/day was higher than those fed two meals/day in 20˚C water. A second-order polynomial analysis based on WG suggested the optimal feeding frequency for juvenile Korean rockfish was five meals/day at 17.5˚C and six meals/day at 20˚C, indicating that fish reared in higher water temperature require higher feeding frequencies.