• 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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• 제50권6호
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• pp.745-749
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• 2017

We investigated the effects of different dietary lipid levels (7% or 14%) and feeding frequency (1-4 meals per day) on the growth performance and body composition of juvenile fancy carp Cyprinus carpio var. koi. Three replicate groups of fish (initial mean weight, 11.7 g) were fed to visual satiety with sinking dry pellet diets for 8 weeks. Neither feeding frequency nor lipid level affected fish survival. Weight gain was affected by feeding frequency but not dietary lipid level. Weight gain significantly increased with increased feeding frequency. Feed efficiency and protein efficiency ratio were affected by feeding frequency, but not dietary lipid level. Daily feed intake was affected by feeding frequency and dietary lipid level. Whole body moisture, crude lipid and ash contents were affected by feeding frequency, but not dietary lipid level. Based on these results, we conclude that the appropriate feeding frequency for the optimum growth of fancy carp fingerlings is four meals per day using sinking dry pellet.

• Fisheries and Aquatic Sciences
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• 제5권3호
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• pp.229-234
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• 2002

Possibility of raising sunshine bass during the winter season in Korea was investigated. Also, the effect of feed on growth and body composition of sunshine bass was compared at the various salinity. Twenty sunshine bass $(Mean\;weight\;\pm S.D.\: :\;53.9 \pm 0.24 g)$ were stocked into the eighteen circular flow-through tanks. A 2 (feed) $\times$ 3 (salinity) factorial design with triplicate was used for this study. Feed was prepared into the 2 groups: the raw fish-based me>ist pellet (MP) containing $59.5\%$ crude protein and $9.4\%$ crude lipid, and commercial sinking red sea bream feed (CF) containing $49.9\%$ crude protein and $9.4\%$ crude lipid, respectively. And salinity was prepared into the 3 groups: freshwater $(0\%)$, brackishwater $(15\%)$, and seawater $(32\%)$. Fish were fed to satiation twice daily for 6 days a week. Fish were all survived at the end of the 8-week feeding trial. Weight gain (WG) and specific growth rate (SGR) of sunshine bass were significantly (P<0.05) affected by both feed and salinity. WG and SGR of sunshine bass fed the MP were significantly (P<0.05) higher than those of fish fed the CF in the same salinity. Amount of dry feed fed was significantly (P<0.05) affected by both feed and salinity. Feed consumption by sunshine bass fed on the MP was significantly (P<0,05) higher than by fish fed on the CF in the same salinity. Feed efficiency ratio (FER) was significantly (P<0,05) affected by salinity, but not by feed. Protein efficiency ratio (PER) was significantly (P<0.05) affected by both feed and salinity. Moisture and protein content of the whole-body of fish was not significantly (P>0.05) affected by either feed or salinity. However, lipid and ash content of the whole-body of fish was significantly (P<0.05) affected by salinity, but not by feed. In conclusion, the MP was superior to CF for growth of sunshine bass during the winter season in Korea and no mortality occurred. And sunshine bass seemed to grow better in freshwater $(0\%)$ and brac-kishwater $(15\%)$ than seawater $(32\%)$ under these experimental conditions, in terms of improvement in FER and PER in freshwater or brackishwater.