Yong Jin Kang
National Fisheries Research & Development Institute
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Featured researches published by Yong Jin Kang.
Fisheries Science | 2007
Kyoung-Duck Kim; Kyong-Min Kim; Yong Jin Kang
This study was carried out to investigate the influences of feeding frequency of extruded pellet and moist pellet on growth and body composition of juvenile flounder (initial mean weight 6.3 g) in sub optimal water temperatures. A 2 (diets: extruded pellet and moist pellet)×2 (feeding frequencies: two and three times daily)×2 (water temperatures: 12 and 17°C) factorial design with three replications was used. After 60 days of feeding, the feeding frequency did not significantly affect growth performance of fish. Weight gain, daily feed intake, feed efficiency and protein efficiency ratio were significantly (P<0.05) higher for fish reared at the higher water temperature. At the same water temperature, weight gain, feed efficiency, and protein efficiency ratio were significantly (P<0.05) higher for fish fed the extruded pellet than moist pellet. The results of this study indicate that feeding frequency of two times daily is sufficient for optimal growth of juvenile flounder when reared in suboptimal water temperatures, and an increase in water temperature from 12 to 17°C improved growth and feed efficiency.
Asian-australasian Journal of Animal Sciences | 2012
Kyoung-Duck Kim; Sang Gu Lim; Yong Jin Kang; Kang-Woong Kim; Maeng Hyun Son
A 3×2 factorial experiment was conducted to determine the effects of dietary protein and lipid levels on the growth and body composition of juvenile far eastern catfish. Six diets were formulated to contain three levels of protein (20%, 30% and 40%) and two levels of lipid (9% and 17%). Triplicate groups of fish (initial body weight of 7.6 g) were hand-fed to apparent satiation for 66 days. Final mean weight was improved with increasing dietary protein and lipid levels, and the highest final mean weight was observed in fish fed the 40/17 (% protein/% lipid) diet. No significant difference was observed in final mean weight for fish fed between 30/17 diet and 40/9 diet. Feed efficiency of fish fed the diets containing over 30% protein levels with 9% and 17% lipid levels were significantly higher than those of fish fed the 20% protein levels. Feed efficiency of fish fed the 30/17 diet was not significantly different from that of fish fed the 40/9 diet or 40/17 diet. Feed efficiency and protein efficiency ratio of fish fed the 20% protein diets with 17% lipid level were significantly higher than those of fish fed 9% lipid diet. Daily feed intake of fish tended to decrease with increasing dietary protein and lipid levels. Moisture content of whole body in fish fed the 9% lipid diets was significantly higher than that of fish fed the 17% lipid diets at the same protein level, but the opposite trends were found for crude lipid content. Significant effects of dietary lipid were observed for most fatty acids, according to their relative values in the diets. The results of this study suggest that the protein requirement for maximum growth of juvenile far eastern catfish may be higher than 40%, and an increase of dietary lipid level from 9% to 17% can improve growth and feed utilization.
Korean Journal of Fisheries and Aquatic Sciences | 2012
Sang Gu Lim; Kwang Seog Kim; Yong Jin Kang; Eung-Oh Kim; Maeng Hyun Son; Cheul Min An; Kang-Woong Kim; Yong-Chul Cho; Kyoung-Duck Kim
Two feeding trials were conducted to evaluate the effects of experimental extruded pellets (EEPs) and commercial EPs (CEPs) on Far Eastern catfish Silurus asotus in pilot- (experiment I) and commercial-scale (experiment II) tanks. Four diets were prepared: three EEPs (EEP1, EEP2 and EEP3) that contained different amounts of tuna fish meal, soybean meal, and squid liver oil, and one CEP diet. In experiment I, three replicate groups of juveniles were fed one of the four EPs in pilot-scale tanks for 19 weeks. The weight gains (WGs) of fish fed EEP1 and CEP were significantly higher than those of fish fed EEP2 or EEP3. The highest feed efficiency (FE) was observed in fish fed the CEP diet ( P<0.05), and the FE of fish fed EEP1 and EEP3 were significantly higher than that with EEP2 ( P<0.05). In experiment II, juveniles were fed one of four EPs in commercial-scale tanks for 19 weeks. WG and FE values of fish fed EEP1 and CEP were higher than those of fish fed EEP2 and EEP3. The results of this study indicate that the dietary formulation used in EEP1 could be used as a practical feed for Far Eastern catfish.
Fisheries and Aquatic Sciences | 2011
Kyoung-Duck Kim; Kang-Woong Kim; Yong Jin Kang; Maeng Hyun Son; Sang-Min Lee
This study determined the effects of the dietary moisture level and feeding rate on the growth and gastric evacuation of young olive flounder. Four experimental diets with different moisture levels (9%, 21%, 30%, and 40%) were prepared through the addition of water to the commercial extruded pellet. Three replicate groups of fish (initial weight: 106 ± 1.4 g) were fed diets containing 9%, 21%, 30%, and 40% moisture to satiation or a moisture level of 9% and 30% at a restricted feeding rate (95% of satiation) for 15 weeks. The mean water temperature was 22 ± 1.6oC during the feeding trial. Gastric evacuation rates were determined post-feeding. The dietary moisture levels did not significantly affect weight gain, but the weight of the fish receiving 9% and 30% moisture diets to 95% satiation were significantly lower than those of the fish fed 9-40% moisture diets to 100% satiation (P< 0.05). The feed efficiency, protein efficiency ratio, viscerosomatic index, and survival were not significantly affected by the dietary moisture levels and feeding rates. The daily feed intake of the fish fed to 100% satiation did not significantly differ among the treatment groups. The stomach contents that peaked within 3 h of feeding gradually decreased, and the stomachs of fish were completely evacuated within 18 h. The contents of the intestine peaked at 3-12 h post-feeding, and then declined with the intestine being mostly evacuated at 30 h. The moisture of the stomach contents reached approximately 70% within 3 h post-feeding and gradually increased to approximately 75% within 12 h. No considerable differences were observed in the gastric evacuation and moisture levels of the stomach contents in the fish fed the different diets. The results of this study suggest that the gastric evacuation of olive flounder was not affected by the dietary moisture level and that the addition of water into the diet displayed no beneficial effects on the growth of young olive flounder.
Journal of The World Aquaculture Society | 2007
Kyoung-Duck Kim; Yong Jin Kang; Kang-Woong Kim; Kyong-Min Kim
Aquaculture | 2006
Kyoung-Duck Kim; Kyong-Min Kim; Kang-Woong Kim; Yong Jin Kang; Sang-Min Lee
Korean Journal of Food Science and Technology | 2009
Mi-Soon Jang; Yong Jin Kang; Kang-Woong Kim; Kyoung-Duck Kim; HaeYoung Moon Lee; Saet-Byeol Heo
Journal of The World Aquaculture Society | 2010
Kyoung-Duck Kim; Yong Jin Kang; HaeYoung Moon Lee; Kang-Woong Kim; Mi-Soon Jang; Se-Min Choi; Sang-Min Lee; Sung Hwoan Cho
Korean Journal of Fisheries and Aquatic Sciences | 2010
Kyoung-Duck Kim; Jin Do Kim; Sang Gu Lim; Yong Jin Kang; Maeng Hyun Son
Korean Journal of Fisheries and Aquatic Sciences | 2009
Kang-Woong Kim; Yong Jin Kang; Kyoung-Duck Kim; Maeng Hyun Son; Se-Min Choi; Sungchul C. Bai; Kyeong-Jun Lee