Jeong-Yeol Lee - Independent Researcher (original) (raw)

Papers by Jeong-Yeol Lee

Research paper thumbnail of Variation of Oxygen Consumption, Operculum Movement Number and Hemoglobin by Water Temperature Change in Rainbow Trout Oncorhynchus mykiss

Korean Journal of Ichthyology, 2008

The objective of this investigation was to examine oxygen consumption (OC) and operculum movement... more The objective of this investigation was to examine oxygen consumption (OC) and operculum movement number (OMN) of rainbow trout Oncorhynchus mykiss as a function of changes in water temperature (WT). The WT of the rearing facility was increased from 4� � C to 28� � C stepwise at 1� C day at each WT (5, 10, 15, 17, 20, 23, 26, and 28� � C) then OC and OMN were measured. The OC of the fish increased linearly with WT: O= =25.0240 WT+ +17.5400 in the range of 4~23� � C However, at 26 and 28� � C the OC declined to around the level at 10� � C. The OMN also increased linearly with temperature: OMN= =4.4847 WT+ +59.2150 in the range of 4~23� C but at 26 and 28� � C the OMN of the fish dropped slightly. The OC and OMN of the fish showed peak at 23� C with the lowest values at 4� � C. In the range of 4~23� � C, the relationship between OC and OMN of the fish was expressed as a linear equation: OC= = 0.0923 OMN--308.2100. The OC of fish transferred from 15� � C to certain temperatures without acclimation showed a lower OC at 5 and 10� � C but above 15� C the OC increased/decreased with temperature. The trout died in temperatures above 28� C even when acclimated step by step with a 1� � C day increase in WT. In this experiment, a negative physiological changs occurred in the experimental fish at 23� � C suggesting that the optimal physiological temperature range of rainbow trout is 10~20� � C.

Research paper thumbnail of Physiological Responses to Three Different Levels of Vibration Stress in Catfish, Silurus asotus

Ecology and Resilient Infrastructure, 2015

The purpose of this study is to determine the effects of vibration on primary (e.g. plasma cortis... more The purpose of this study is to determine the effects of vibration on primary (e.g. plasma cortisol), secondary (e.g. plasma glucose, aspartate aminotransferase (AST), alanine aminotransferase (ALT), Na + , K + and Cl -) and tertiary (e.g. mortality) stress responses in cultured catfish, Silurus asotus. For this purpose, three groups (one control group and two stress groups) were set up. The control group was exposed to vibration corresponding to 48 decibel (dB) volt (V) (produced using electric vibrators) for 15 minutes per hour every day, and the two stress groups were exposed to vibrations corresponding to 58 and 68 dB (V) (produced using the same electric vibrators), equally, for 15 minutes per hour every day. Blood was sampled at day 0 (before starting vibration stress tests), and at days 1, 3, 5, 7, 9 and 11 (after starting vibration stress tests). According to the results, the catfish physiologically showed ''typical'' stress responses when they were exposed to chronic vibration. This indicates that such chronic vibration caused substantial stress to catfish; especially, persistently elevated plasma AST and ALT levels observed caused adverse effects to them. In conclusion, chronic vibration could significantly affect hematological characteristics in catfish.

Research paper thumbnail of Optimum Dietary Protein Levels and Protein to Energy Ratios in Olive Flounder Paralichthys olivaceus

Journal of the World Aquaculture Society, 2007

The olive flounder Purulichthys ofivuceus is one of the most commercially important fish species ... more The olive flounder Purulichthys ofivuceus is one of the most commercially important fish species in Korea. In order to formulate better diets for cultured olive flounder we evaluated the optimum dietary protein requirements for larval, fry and juvenile olive flounder, and the optimum dietary protein to energy ratio for juvenile olive flounder. Results of four separate experiments suggested that the optimum dietary protein requirements were 60% in larvae (0.3 g), 46.4-51.2% in 4.1-g juvenile, and M% in 13.3 g growing olive flounder. The optimum dietary protein to energy ratio based on weight gain, feed efficiency, specific growth rate, and protein retention efficiency was 27-28 mg protein/kJ 2 energy (35 and 45% CP for diets containing 12.5 and 16.7 kJ energylg diet, respectively).

Research paper thumbnail of Environmental Assessment of Channel Catfish Ictalurus punctatus Farming in Alabama

Journal of the World Aquaculture Society, 2007

An environmental assessment was made of Alabama channel catfish Ictalurus punctatus farming which... more An environmental assessment was made of Alabama channel catfish Ictalurus punctatus farming which is concentrated in the west‐central region of the state. There are about 10,000 ha of production ponds with 10.7% of the area for fry and fingerlings and 89.3% for food fish. Food fish production was about 40,800 tons in 1997. Watershed ponds filled by rainfall and runoff make up 76% of total pond area. Water levels in many of these ponds are maintained in dry weather with well water. The other ponds are embankment ponds supplied by well water. Harvest is primarily by seine‐through procedures and ponds are not drained frequently. The main points related to Alabama catfish farming and environment issues are as follows: 1) catfish farming in Alabama is conservative of water, and excluding storm overflow, about two pond volumes are intentionally discharged from each pond in 15 yr; 2) overflow from ponds following rains occurs mostly in winter and early spring when pond water quality is goo...

Research paper thumbnail of Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica

This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-6) levels... more This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-6) levels on growth performance and body composition in juvenile eel, Anguilla japonica. Six semi-purified experimental diets were formulated to be iso nitrogenous and iso-caloric containing 55.0% crude protein and 15% crude lipid (18.3 kJ of available energy g-1). Six different levels of AA were added to the basal diet, with 0, 0.2, 0.4, 0.6, 0.8 or 1.2% on a dry matter (DM) basis, respectively (AA0.07, AA0.22, AA0.43, AA0.57, AA0.78 or AA1.23). After a conditioning period, fish initially averaging 27±0.5 g (mean±SD) were randomly distributed into each aquarium as triplicate groups of 20 fish each. One of six experimental diets was fed on a DM basis to fish in three randomly selected aquaria at a rate of 2-3% of total body weight twice a day. At the end of the 12-week feeding trial, weight gain (WG) and feed efficiency (FE) of fish fed AA0.78 and AA1.23 diets were significantly higher than of fish fed AA0.07, AA0.22 and AA0.43 diets (p<0.05). Specific growth rate (SGR) of fish fed the AA0.78 diet was significantly higher than of fish fed AA0.07, AA0.22 and AA0.43 diets (p<0.05). However, there were no significant differences in WG, SGR and FE among fish fed AA0.57, AA0.78 and AA1.23 diets (p>0.05). Whole body AA deposition of fish fed the AA1.23 diet was significantly higher than for the other diets (p<0.05). Broken-line model analysis on the basis of WG and SGR indicated that the dietary AA requirement could be greater than 0.69% but less than 0.71% of the diet in juvenile eel. The growth-promoting activity of AA observed in the present study provides strong support for the contention that dietary AA is essential for juvenile eel.

Research paper thumbnail of The Effect of pH on the Fertilization and Hatching Rate of Far Eastern catfish ( Silurus asotus)

The Effect of pH on the Fertilization and Hatching Rate of Far Eastern catfish ( Silurus asotus)

Research paper thumbnail of Effect of Feeding Frequency, Water Temperature, and Stocking Density on the Growth of Tiger Puffer, Takifugu rubripes

Journal of the World Aquaculture Society, 2006

Effects of daily feeding frequency, water temperature, and stocking density on the growth of tige... more Effects of daily feeding frequency, water temperature, and stocking density on the growth of tiger puffer, Takifugu rubripes, fry were examined to develop effective techniques to produce tiger puffer in a closed recirculation system. Fish of 4, 14, and 180 g in initial body weight were fed commercial pellet diets once to five times a day to apparent satiation each by hand for 8 or 12 wk at 20 C. Daily feeding frequency did not affect the growth of 14-and 180-g-size fish. However, the daily feed consumption and weight gain of the 4-g-size fish fed three and five times daily were significantly higher than those of fish fed once daily (P , 0.05). Fish of 4 and 50 g in initial body weight were reared with the pellet diet at 15-30 C for 8 wk. The weight gain of fish increased with increasing water temperature up to 25 C and decreased drastically at 30 C for both sizes. Similar trends were observed for feed efficiency, although 4-g fish had highest efficiency at 20 C. Effects of stocking density on growth were examined with fish of 8, 13, and 100 g in initial body weight. Fish were reared with the pellet diet for 8 or 16 wk at 20 C. Fish were placed in floating net cages in the culture tank, and the stocking density was determined based on the total weight of fish and volume of the net cage. Fish of 8 g in body weight grew up to 35-36 g during the 8-wk rearing period independent of the stocking density of 8, 15, and 31 kg/m 3 at the end of rearing. Final biomass per cage reached 32, 60, and 115 kg/m 3 for 13-g-size fish, and 10, 18, and 35 kg/m 3 for 100-g-size fish, and the growth of the fish tended to decrease with increasing stocking density for both sizes.

Research paper thumbnail of Review of nutritional studies for eel, Anguilla japonica

Review of nutritional studies for eel, Anguilla japonica

Research paper thumbnail of Effects of fulvic acid on growth performance and intestinal health of juvenile loach Paramisgurnus dabryanus (Sauvage)

Effects of fulvic acid on growth performance and intestinal health of juvenile loach Paramisgurnus dabryanus (Sauvage)

Fish & shellfish immunology, Jan 9, 2017

A 60-day feeding trial was conducted to determine the effect of dietary fulvic acid supplements o... more A 60-day feeding trial was conducted to determine the effect of dietary fulvic acid supplements on intestinal digestive activity (enzymatic analysis), antioxidant activity, immune enzyme activity and microflora composition of juvenile loach (initial weight of 6.2 ± 0.1 g) reared in experimental aquaria. Five test diets containing 0, 0.5, 1.0, 1.5, and 2% fulvic acid were randomly assigned to three aquaria, respectively. Elevated growth performance including final weight, weight gain (WG), specific growth rate (SGR) and feed conversion ratio (FCR) was observed in loaches that were fed fulvic acid. Maximal weight gain rates and specific growth rates occurred at the 1.5% additive level. The optimal dietary fulvic requirement for maximal growth of juvenile loach is 16.4 g per kg of the diet based on the quadratic regression analysis of specific growth rate against dietary fulvic acid levels. Furthermore, intestinal protease activity, antioxidant activity, lysozyme activity (LZM), comple...

Research paper thumbnail of Three-dimensional finite element analysis on stress distribution of the mandibular implant-supported cantilever prostheses depending on the designs

The Journal of Korean Academy of Prosthodontics, 2009

서론 1969년 스웨덴의 Bra°nemark이 생체와 금속간의 직접적 인 결합현상을 발견하고 골유착이라는 개념에 대해 보 고한 후 장기간의 실험과 임상자료를 통하여 1980년... more 서론 1969년 스웨덴의 Bra°nemark이 생체와 금속간의 직접적 인 결합현상을 발견하고 골유착이라는 개념에 대해 보 고한 후 장기간의 실험과 임상자료를 통하여 1980년대 이후 골유착성 치근형 임플란트가 치과수복 분야에 널 리 이용되고 있다. 1,2 임플란트 지지 보철물은 생체친화성 을 가져야 하고, 교합시에 발생하는 응력이 임플란트 주 위 지지골과 보철물의 하중지지 능력 한계 내에서 적절 히 분산될 수 있도록 보철물을 설계하는 것이 생역학적 측면에서 중요하다. 3,4 골유착성 임플란트 보철물이 구강 내에서 장기간 성공적으로 유지되어 정상적인 기능을 하기 위해서는 임플란트 재료 자체의 생체적 합성, 골조 직의 양과 질, 외과 술식 및 상부 보철물의 설계 등 여러 요소에 달려 있지만 5,6 특히 골유착성 임플란트 보철물은 생체기능성의 측면에서 구강이라는 특수한 환경 내에서 저작시 발생하는 교합력에 대해 적절히 지지할 수 있도 록 생체역학적으로 설계되어야 한다. 7,8 하악 무치악의 경우 양측 이공 사이에 4개 또는 6개의 임플란트 식립후 대구치 부위가 자유단으로 하는 의치 가 주로 사용되어 왔지만 캔틸레버형 보철물은 캔틸레 버로 연장된 부위에 저작력이 작용하면 임플란트와 상 부보철물에 압력과 동시에 굽힘 현상을 유발한다. 9 이러 한 압력과 굽힘은 골구조로 전달되어 임플란트 주위 치 밀골에 과중한 응력집중을 발생시켜 지지골 흡수, 파괴 등 실패의 원인의 하나로 알려져 있다. Bra°nemark팀에서 는 상악이 무치악 총의치일 때 Cantilever fixed hybrid bridge로 무치악 하악을 성공적으로 치료할 수 있음을 증 명하였고, 1990년 Zarb 10 등은 기존 방식대로 정밀한 framework의 passive fit 및 이상적인 교합관계의 수복에도 불구하고 캔틸레버 부위의 framework-retaining screw 및 지대주 나사의 파절을 보고하였다. 그럼에도 불구하고 구치부 치조골의 임플란트 식립을 위한 해부학적 제한 그리고 경제적인 부담 등의 이유로 캔틸레버형 보철물 임플란트 지지 하악 캔틸레버 보철물의 디자인에 따른 저작압 분산에 관한 삼차원 유한요소 분석 반재혁•신상완*•김선종•이정열 고려대학교 임상치의학 대학원 고급보철학과 연구목적: 캔틸레버의 위치와 길이는 임플란트와 보철물 또한 주위 골조직의 응력분포에 중요한 영향을 미친다. 하악 무치악의 경우 기존에는 양측 이공사 이에 4 -6개의 임플란트를 식립하고 상부보철물을 캔틸레버형으로 제작해왔는데 캔틸레버 부위에 무리한 하중이 작용하게 되면 응력의 집중과 굽힘 현상 으로 인하여 최후방 임플란트 부위의 지지골 파괴와 임플란트 및 상부 보철물의 파절을 초래했다. 이러한 캔틸레버의 약점을 보완하기 위해 1992년 McCartney가 Rest implant 개념을 2003년에는 Maló 등이 All-on-Four implant 개념을 소개하여 기존 보철물의 캔틸레버 길이를 줄이려고 노력하였다. 재료 및 방법: 기존의 캔틸레버형 보철물과 rest implant, All-on-Four implant 시스템을 삼차원 모델링하여 하중을 제 1대구치 부위에 수직으로 300 N, 수평으로 설측에서 협측으로 75 N을 가하여 지지골과 임플란트, 상부보철물에 발생하는 응력의 크기와 분포 및 분산양상을 유한요소 해석 프로그램인 ANSYS (Ver. 10.0, Swanson Analysis System Inc., USA)를 이용하여 분석하였다.

Research paper thumbnail of Effect of rhBMP-2 Immobilized Anorganic Bovine Bone Matrix on Bone Regeneration

Effect of rhBMP-2 Immobilized Anorganic Bovine Bone Matrix on Bone Regeneration

International Journal of Molecular Sciences, 2015

Anorganic bovine bone matrix (Bio-Oss®) has been used for a long time for bone graft regeneration... more Anorganic bovine bone matrix (Bio-Oss®) has been used for a long time for bone graft regeneration, but has poor osteoinductive capability. The use of recombinant human bone morphogenetic protein-2 (rhBMP-2) has been suggested to overcome this limitation of Bio-Oss®. In the present study, heparin-mediated rhBMP-2 was combined with Bio-Oss® in animal experiments to investigate bone formation performance; heparin was used to control rhBMP-2 release. Two calvarial defects (8 mm diameter) were formed in a white rabbit model and then implanted or not (controls) with Bio-Oss® or BMP-2/Bio-Oss®. The Bio-Oss® and BMP-2/Bio-Oss® groups had significantly greater new bone areas (expressed as percentages of augmented areas) than the non-implanted controls at four and eight weeks after surgery, and the BMP-2/Bio-Oss® group (16.50 ± 2.87 (n = 6)) had significantly greater new bone areas than the Bio-Oss® group (9.43 ± 3.73 (n = 6)) at four weeks. These findings suggest that rhBMP-2 treated heparinized Bio-Oss® markedly enhances bone regeneration.

Research paper thumbnail of Morphological Characteristics of the Topshell in the Jeju Coastal Waters

Morphological characteristics of the topshell, Turbo cornutus Solander were studied on the basis ... more Morphological characteristics of the topshell, Turbo cornutus Solander were studied on the basis of shell growth and fatness from April 1978 to October 1979. The Sampled areas were coastal waters of Jeju City, Seongsanpo, Moseulpo and Seogwipo in Jeju. The average shell length of the topshell from Jeju City area was smaller than those of the other three areas, and also the spine number of the 1st row on the shell from Jeju City area was fewer than the others. Sex ratios from each areas represented about 1:1. The relationship between shell length and shell breadth showed regression line and the value of slope for the specimen from Seongsanpo was the lowest. The relationship between shell length and total weight showed exponential curve, and the value was the highest in the specimens from Moseulpo. The value of slope on the relationship between total weight and meat weight was the highest in those from Moseulpo and the lowest from Jeju City. The regression line of relationship between...

Research paper thumbnail of Dietary Squid Liver Powder (SLP) with Dehulled Soybean Meal (DHSM) as a Fish Meal (FM) Substitute for Olive Flounder, Paralichthys olivaceus

Dietary Squid Liver Powder (SLP) with Dehulled Soybean Meal (DHSM) as a Fish Meal (FM) Substitute for Olive Flounder, Paralichthys olivaceus

Research paper thumbnail of Evaluation of Dietary Squid Liver Powder-Soy Protein Concentrate Premix as a Fish Meal Substitute for Juvenile Olive Flounder, Paralichthys olivaceus

This study was conducted to investigate the effects of dietary propolis supplementation on growth... more This study was conducted to investigate the effects of dietary propolis supplementation on growth performance, immune responses, disease resistance and body composition of juvenile eel, Anguilla japonica, in order to evaluate its bioavailability as a feed additive for this species. A total of 540 fish averaging 7 .7 * 0.22 g (mean + SD) were randomly distributed into 18 tanks in groups of 30, and each tank was then randomly assigned to one of three replicates of six diets containing 0 (P0), 0.25 (Po.zs), 0.5 (Pg.s), 1.0 (P1), 2.0 (P2) and 4.0 (P4) Vo dietary propolis. At the end of 12 weeks of feeding trial, weight gain (WG), specific growth rate (SGR), feed efficiency (FE) and protein efficiency ratio (PER) of fish fed P6.5 diet were significantly higher than those of fish fed Pe, Pr, Pz and Pa diets (P < 0.05). These parameters were 148.97o, 0.727o duy-t, 94.4Vo and 2.9, respectively for fish fed Pe.5 diet. Serum lysozyme activity of fish fed Ps.5 (105.7 units mJ--r) and P1 (106.0 units ml--l) diets were significantly higher than those of fish fed P6, Po.zs,Pz and Pa diets. Mucus lyscizyme activity of fish fed P1 (8.4 units 10 cm-2) diet was significantly higher than those of fish fed P6, P2 and Pa diets. Results indicated that the optimum dietary propolis supplementation levels could be 0.25{.5%o for optimum growth and feed efficiency, and 0.5-l7o for enhanced immune responses and disease resistance in eel, A. japonica. This study may suggest that the dietary propolis level for the optimum immune responses could be higher than the level for the optimum growth of eel.

Research paper thumbnail of Acute Toxicity of Synthetic Detergent on the Larvae of Loach, Misgurnus angillicaudatus

Short-term acute toxicity of synthetic detergent(LAS) to larvae of loach, Misgurnus angillicaudat... more Short-term acute toxicity of synthetic detergent(LAS) to larvae of loach, Misgurnus angillicaudatus was examined by static bioassay. The larvae were exposed to 15 different concentration of synthetic detergent for 16, 48, 72, 96 and 120 hours in order to determine median lethal concentration(). The mortarlity of larvae was showed within 120, 96, 48 and 16 hours for 6, 18, 30 and 38 ppm, respectively. The median lethal concentration values of the larvae were 12.59 ppm for 48 hours, 4.00 ppm for 96 hours and 1.02 ppm for 120 hours. The permissible toxicant concentration of acute toxicity to larvae was ppm, and application factor of the synthetec detergent was . The median lethal time() for different concentration also was determined. The of 0.2 ppm was found within 165.1 hours and 2 ppm was 106.2 hours, while the of 8 ppm was 60.3 hours and that of 38 ppm was 23.5 hours.

Research paper thumbnail of Compensatory Responses of Nile Tilapia Oreochromis niloticus under Different Feed-Deprivation Regimes

We investigated compensatory growth of Nile Tilapia Oreochromis niloticus in structural size and ... more We investigated compensatory growth of Nile Tilapia Oreochromis niloticus in structural size and live weight in response to different deprivation periods and refeeding. Four treatments were assigned randomly to fish in 12 glass tanks, with each treatment performed in triplicate. The control group was fed to satiation three times a day throughout the experiment. The other three treatment groups were starved for 1 week (S1), 2 weeks (S2), or 4 weeks (S4) and then fed until the end of the experiment. After the experiment, no significant differences were observed among S1, S2, and the control group in average weight or length, whereas the weight and length of S4 were significantly reduced. Relative condition factors of the three starved groups decreased significantly until the end of the restricted period but recovered rapidly after refeeding. The specific growth rate in weight () of the three restricted groups recovered quickly upon refeeding and were significantly higher than the cont...

Research paper thumbnail of Fish Community and Estimation of Optimal Ecological Flowrate in Up and Downstream of Hoengseong Dam

Fish Community and Estimation of Optimal Ecological Flowrate in Up and Downstream of Hoengseong Dam

In this study, a comprehensive field monitoring was conducted to understand habitat conditions of... more In this study, a comprehensive field monitoring was conducted to understand habitat conditions of fish species in up and downstream of Hoengseong Dam. Based on the monitoring data, riverine health conditions such as composition ratio of fish species, bio-diversity (dominance index, diversity, evenness and richness), index of biological integrity (IBI) and qualitative habitat evaluation index (QHEI) were assessed, and optimal ecological flowrates (OEF) were estimated using the habitat suitability indexes (HSI) established for three fish species Coreoleuciscus splendidus, Pungtungia herzi and Microphysogobio longidorsalis selected as icon species using the physical habitat simulation system (PHABSIM). The total number of species sampled was 20 species, and two species of Zacco platypus (30.4%) and C. splendidus (20.9%) dominated the fish community. As a result, it was revealed that IBI and QHEI values decreased from upstream to downstream along the river. The estimated IBI value range...

Research paper thumbnail of Effect of rhBMP-2 Immobilized Anorganic Bovine Bone Matrix on Bone Regeneration

Effect of rhBMP-2 Immobilized Anorganic Bovine Bone Matrix on Bone Regeneration

International journal of molecular sciences, 2015

Anorganic bovine bone matrix (Bio-Oss®) has been used for a long time for bone graft regeneration... more Anorganic bovine bone matrix (Bio-Oss®) has been used for a long time for bone graft regeneration, but has poor osteoinductive capability. The use of recombinant human bone morphogenetic protein-2 (rhBMP-2) has been suggested to overcome this limitation of Bio-Oss®. In the present study, heparin-mediated rhBMP-2 was combined with Bio-Oss® in animal experiments to investigate bone formation performance; heparin was used to control rhBMP-2 release. Two calvarial defects (8 mm diameter) were formed in a white rabbit model and then implanted or not (controls) with Bio-Oss® or BMP-2/Bio-Oss®. The Bio-Oss® and BMP-2/Bio-Oss® groups had significantly greater new bone areas (expressed as percentages of augmented areas) than the non-implanted controls at four and eight weeks after surgery, and the BMP-2/Bio-Oss® group (16.50 ± 2.87 (n = 6)) had significantly greater new bone areas than the Bio-Oss® group (9.43 ± 3.73 (n = 6)) at four weeks. These findings suggest that rhBMP-2 treated heparin...

Research paper thumbnail of Effects of Dietary Arachidonic Acid (20:4n-6) Levels on Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica

Effects of Dietary Arachidonic Acid (20:4n-6) Levels on Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica

Asian-Australasian Journal of Animal Sciences, 2010

ABSTRACT This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-... more ABSTRACT This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-6) levels on growth performance and body composition in juvenile eel, Anguilla japonica. Six semi-purified experimental diets were formulated to be isonitrogenous and iso-caloric containing 55.0% crude protein and 15% crude lipid (18.3 kJ of available energy ). Six different levels of AA were added to the basal diet, with 0, 0.2, 0.4, 0.6, 0.8 or 1.2% on a dry matter (DM) basis, respectively (). After a conditioning period, fish initially averaging 270.5 g (meanSD) were randomly distributed into each aquarium as triplicate groups of 20 fish each. One of six experimental diets was fed on a DM basis to fish in three randomly selected aquaria at a rate of 2-3% of total body weight twice a day. At the end of the 12-week feeding trial, weight gain (WG) and feed efficiency (FE) of fish fed and diets were significantly higher than of fish fed diets (p

Research paper thumbnail of Body composition and compensatory growth in Nile tilapia Oreochromis niloticus under different feeding intervals

Body composition and compensatory growth in Nile tilapia Oreochromis niloticus under different feeding intervals

Chinese Journal of Oceanology and Limnology, 2015

Research paper thumbnail of Variation of Oxygen Consumption, Operculum Movement Number and Hemoglobin by Water Temperature Change in Rainbow Trout Oncorhynchus mykiss

Korean Journal of Ichthyology, 2008

The objective of this investigation was to examine oxygen consumption (OC) and operculum movement... more The objective of this investigation was to examine oxygen consumption (OC) and operculum movement number (OMN) of rainbow trout Oncorhynchus mykiss as a function of changes in water temperature (WT). The WT of the rearing facility was increased from 4� � C to 28� � C stepwise at 1� C day at each WT (5, 10, 15, 17, 20, 23, 26, and 28� � C) then OC and OMN were measured. The OC of the fish increased linearly with WT: O= =25.0240 WT+ +17.5400 in the range of 4~23� � C However, at 26 and 28� � C the OC declined to around the level at 10� � C. The OMN also increased linearly with temperature: OMN= =4.4847 WT+ +59.2150 in the range of 4~23� C but at 26 and 28� � C the OMN of the fish dropped slightly. The OC and OMN of the fish showed peak at 23� C with the lowest values at 4� � C. In the range of 4~23� � C, the relationship between OC and OMN of the fish was expressed as a linear equation: OC= = 0.0923 OMN--308.2100. The OC of fish transferred from 15� � C to certain temperatures without acclimation showed a lower OC at 5 and 10� � C but above 15� C the OC increased/decreased with temperature. The trout died in temperatures above 28� C even when acclimated step by step with a 1� � C day increase in WT. In this experiment, a negative physiological changs occurred in the experimental fish at 23� � C suggesting that the optimal physiological temperature range of rainbow trout is 10~20� � C.

Research paper thumbnail of Physiological Responses to Three Different Levels of Vibration Stress in Catfish, Silurus asotus

Ecology and Resilient Infrastructure, 2015

The purpose of this study is to determine the effects of vibration on primary (e.g. plasma cortis... more The purpose of this study is to determine the effects of vibration on primary (e.g. plasma cortisol), secondary (e.g. plasma glucose, aspartate aminotransferase (AST), alanine aminotransferase (ALT), Na + , K + and Cl -) and tertiary (e.g. mortality) stress responses in cultured catfish, Silurus asotus. For this purpose, three groups (one control group and two stress groups) were set up. The control group was exposed to vibration corresponding to 48 decibel (dB) volt (V) (produced using electric vibrators) for 15 minutes per hour every day, and the two stress groups were exposed to vibrations corresponding to 58 and 68 dB (V) (produced using the same electric vibrators), equally, for 15 minutes per hour every day. Blood was sampled at day 0 (before starting vibration stress tests), and at days 1, 3, 5, 7, 9 and 11 (after starting vibration stress tests). According to the results, the catfish physiologically showed ''typical'' stress responses when they were exposed to chronic vibration. This indicates that such chronic vibration caused substantial stress to catfish; especially, persistently elevated plasma AST and ALT levels observed caused adverse effects to them. In conclusion, chronic vibration could significantly affect hematological characteristics in catfish.

Research paper thumbnail of Optimum Dietary Protein Levels and Protein to Energy Ratios in Olive Flounder Paralichthys olivaceus

Journal of the World Aquaculture Society, 2007

The olive flounder Purulichthys ofivuceus is one of the most commercially important fish species ... more The olive flounder Purulichthys ofivuceus is one of the most commercially important fish species in Korea. In order to formulate better diets for cultured olive flounder we evaluated the optimum dietary protein requirements for larval, fry and juvenile olive flounder, and the optimum dietary protein to energy ratio for juvenile olive flounder. Results of four separate experiments suggested that the optimum dietary protein requirements were 60% in larvae (0.3 g), 46.4-51.2% in 4.1-g juvenile, and M% in 13.3 g growing olive flounder. The optimum dietary protein to energy ratio based on weight gain, feed efficiency, specific growth rate, and protein retention efficiency was 27-28 mg protein/kJ 2 energy (35 and 45% CP for diets containing 12.5 and 16.7 kJ energylg diet, respectively).

Research paper thumbnail of Environmental Assessment of Channel Catfish Ictalurus punctatus Farming in Alabama

Journal of the World Aquaculture Society, 2007

An environmental assessment was made of Alabama channel catfish Ictalurus punctatus farming which... more An environmental assessment was made of Alabama channel catfish Ictalurus punctatus farming which is concentrated in the west‐central region of the state. There are about 10,000 ha of production ponds with 10.7% of the area for fry and fingerlings and 89.3% for food fish. Food fish production was about 40,800 tons in 1997. Watershed ponds filled by rainfall and runoff make up 76% of total pond area. Water levels in many of these ponds are maintained in dry weather with well water. The other ponds are embankment ponds supplied by well water. Harvest is primarily by seine‐through procedures and ponds are not drained frequently. The main points related to Alabama catfish farming and environment issues are as follows: 1) catfish farming in Alabama is conservative of water, and excluding storm overflow, about two pond volumes are intentionally discharged from each pond in 15 yr; 2) overflow from ponds following rains occurs mostly in winter and early spring when pond water quality is goo...

Research paper thumbnail of Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica

This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-6) levels... more This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-6) levels on growth performance and body composition in juvenile eel, Anguilla japonica. Six semi-purified experimental diets were formulated to be iso nitrogenous and iso-caloric containing 55.0% crude protein and 15% crude lipid (18.3 kJ of available energy g-1). Six different levels of AA were added to the basal diet, with 0, 0.2, 0.4, 0.6, 0.8 or 1.2% on a dry matter (DM) basis, respectively (AA0.07, AA0.22, AA0.43, AA0.57, AA0.78 or AA1.23). After a conditioning period, fish initially averaging 27±0.5 g (mean±SD) were randomly distributed into each aquarium as triplicate groups of 20 fish each. One of six experimental diets was fed on a DM basis to fish in three randomly selected aquaria at a rate of 2-3% of total body weight twice a day. At the end of the 12-week feeding trial, weight gain (WG) and feed efficiency (FE) of fish fed AA0.78 and AA1.23 diets were significantly higher than of fish fed AA0.07, AA0.22 and AA0.43 diets (p<0.05). Specific growth rate (SGR) of fish fed the AA0.78 diet was significantly higher than of fish fed AA0.07, AA0.22 and AA0.43 diets (p<0.05). However, there were no significant differences in WG, SGR and FE among fish fed AA0.57, AA0.78 and AA1.23 diets (p>0.05). Whole body AA deposition of fish fed the AA1.23 diet was significantly higher than for the other diets (p<0.05). Broken-line model analysis on the basis of WG and SGR indicated that the dietary AA requirement could be greater than 0.69% but less than 0.71% of the diet in juvenile eel. The growth-promoting activity of AA observed in the present study provides strong support for the contention that dietary AA is essential for juvenile eel.

Research paper thumbnail of The Effect of pH on the Fertilization and Hatching Rate of Far Eastern catfish ( Silurus asotus)

The Effect of pH on the Fertilization and Hatching Rate of Far Eastern catfish ( Silurus asotus)

Research paper thumbnail of Effect of Feeding Frequency, Water Temperature, and Stocking Density on the Growth of Tiger Puffer, Takifugu rubripes

Journal of the World Aquaculture Society, 2006

Effects of daily feeding frequency, water temperature, and stocking density on the growth of tige... more Effects of daily feeding frequency, water temperature, and stocking density on the growth of tiger puffer, Takifugu rubripes, fry were examined to develop effective techniques to produce tiger puffer in a closed recirculation system. Fish of 4, 14, and 180 g in initial body weight were fed commercial pellet diets once to five times a day to apparent satiation each by hand for 8 or 12 wk at 20 C. Daily feeding frequency did not affect the growth of 14-and 180-g-size fish. However, the daily feed consumption and weight gain of the 4-g-size fish fed three and five times daily were significantly higher than those of fish fed once daily (P , 0.05). Fish of 4 and 50 g in initial body weight were reared with the pellet diet at 15-30 C for 8 wk. The weight gain of fish increased with increasing water temperature up to 25 C and decreased drastically at 30 C for both sizes. Similar trends were observed for feed efficiency, although 4-g fish had highest efficiency at 20 C. Effects of stocking density on growth were examined with fish of 8, 13, and 100 g in initial body weight. Fish were reared with the pellet diet for 8 or 16 wk at 20 C. Fish were placed in floating net cages in the culture tank, and the stocking density was determined based on the total weight of fish and volume of the net cage. Fish of 8 g in body weight grew up to 35-36 g during the 8-wk rearing period independent of the stocking density of 8, 15, and 31 kg/m 3 at the end of rearing. Final biomass per cage reached 32, 60, and 115 kg/m 3 for 13-g-size fish, and 10, 18, and 35 kg/m 3 for 100-g-size fish, and the growth of the fish tended to decrease with increasing stocking density for both sizes.

Research paper thumbnail of Review of nutritional studies for eel, Anguilla japonica

Review of nutritional studies for eel, Anguilla japonica

Research paper thumbnail of Effects of fulvic acid on growth performance and intestinal health of juvenile loach Paramisgurnus dabryanus (Sauvage)

Effects of fulvic acid on growth performance and intestinal health of juvenile loach Paramisgurnus dabryanus (Sauvage)

Fish & shellfish immunology, Jan 9, 2017

A 60-day feeding trial was conducted to determine the effect of dietary fulvic acid supplements o... more A 60-day feeding trial was conducted to determine the effect of dietary fulvic acid supplements on intestinal digestive activity (enzymatic analysis), antioxidant activity, immune enzyme activity and microflora composition of juvenile loach (initial weight of 6.2 ± 0.1 g) reared in experimental aquaria. Five test diets containing 0, 0.5, 1.0, 1.5, and 2% fulvic acid were randomly assigned to three aquaria, respectively. Elevated growth performance including final weight, weight gain (WG), specific growth rate (SGR) and feed conversion ratio (FCR) was observed in loaches that were fed fulvic acid. Maximal weight gain rates and specific growth rates occurred at the 1.5% additive level. The optimal dietary fulvic requirement for maximal growth of juvenile loach is 16.4 g per kg of the diet based on the quadratic regression analysis of specific growth rate against dietary fulvic acid levels. Furthermore, intestinal protease activity, antioxidant activity, lysozyme activity (LZM), comple...

Research paper thumbnail of Three-dimensional finite element analysis on stress distribution of the mandibular implant-supported cantilever prostheses depending on the designs

The Journal of Korean Academy of Prosthodontics, 2009

서론 1969년 스웨덴의 Bra°nemark이 생체와 금속간의 직접적 인 결합현상을 발견하고 골유착이라는 개념에 대해 보 고한 후 장기간의 실험과 임상자료를 통하여 1980년... more 서론 1969년 스웨덴의 Bra°nemark이 생체와 금속간의 직접적 인 결합현상을 발견하고 골유착이라는 개념에 대해 보 고한 후 장기간의 실험과 임상자료를 통하여 1980년대 이후 골유착성 치근형 임플란트가 치과수복 분야에 널 리 이용되고 있다. 1,2 임플란트 지지 보철물은 생체친화성 을 가져야 하고, 교합시에 발생하는 응력이 임플란트 주 위 지지골과 보철물의 하중지지 능력 한계 내에서 적절 히 분산될 수 있도록 보철물을 설계하는 것이 생역학적 측면에서 중요하다. 3,4 골유착성 임플란트 보철물이 구강 내에서 장기간 성공적으로 유지되어 정상적인 기능을 하기 위해서는 임플란트 재료 자체의 생체적 합성, 골조 직의 양과 질, 외과 술식 및 상부 보철물의 설계 등 여러 요소에 달려 있지만 5,6 특히 골유착성 임플란트 보철물은 생체기능성의 측면에서 구강이라는 특수한 환경 내에서 저작시 발생하는 교합력에 대해 적절히 지지할 수 있도 록 생체역학적으로 설계되어야 한다. 7,8 하악 무치악의 경우 양측 이공 사이에 4개 또는 6개의 임플란트 식립후 대구치 부위가 자유단으로 하는 의치 가 주로 사용되어 왔지만 캔틸레버형 보철물은 캔틸레 버로 연장된 부위에 저작력이 작용하면 임플란트와 상 부보철물에 압력과 동시에 굽힘 현상을 유발한다. 9 이러 한 압력과 굽힘은 골구조로 전달되어 임플란트 주위 치 밀골에 과중한 응력집중을 발생시켜 지지골 흡수, 파괴 등 실패의 원인의 하나로 알려져 있다. Bra°nemark팀에서 는 상악이 무치악 총의치일 때 Cantilever fixed hybrid bridge로 무치악 하악을 성공적으로 치료할 수 있음을 증 명하였고, 1990년 Zarb 10 등은 기존 방식대로 정밀한 framework의 passive fit 및 이상적인 교합관계의 수복에도 불구하고 캔틸레버 부위의 framework-retaining screw 및 지대주 나사의 파절을 보고하였다. 그럼에도 불구하고 구치부 치조골의 임플란트 식립을 위한 해부학적 제한 그리고 경제적인 부담 등의 이유로 캔틸레버형 보철물 임플란트 지지 하악 캔틸레버 보철물의 디자인에 따른 저작압 분산에 관한 삼차원 유한요소 분석 반재혁•신상완*•김선종•이정열 고려대학교 임상치의학 대학원 고급보철학과 연구목적: 캔틸레버의 위치와 길이는 임플란트와 보철물 또한 주위 골조직의 응력분포에 중요한 영향을 미친다. 하악 무치악의 경우 기존에는 양측 이공사 이에 4 -6개의 임플란트를 식립하고 상부보철물을 캔틸레버형으로 제작해왔는데 캔틸레버 부위에 무리한 하중이 작용하게 되면 응력의 집중과 굽힘 현상 으로 인하여 최후방 임플란트 부위의 지지골 파괴와 임플란트 및 상부 보철물의 파절을 초래했다. 이러한 캔틸레버의 약점을 보완하기 위해 1992년 McCartney가 Rest implant 개념을 2003년에는 Maló 등이 All-on-Four implant 개념을 소개하여 기존 보철물의 캔틸레버 길이를 줄이려고 노력하였다. 재료 및 방법: 기존의 캔틸레버형 보철물과 rest implant, All-on-Four implant 시스템을 삼차원 모델링하여 하중을 제 1대구치 부위에 수직으로 300 N, 수평으로 설측에서 협측으로 75 N을 가하여 지지골과 임플란트, 상부보철물에 발생하는 응력의 크기와 분포 및 분산양상을 유한요소 해석 프로그램인 ANSYS (Ver. 10.0, Swanson Analysis System Inc., USA)를 이용하여 분석하였다.

Research paper thumbnail of Effect of rhBMP-2 Immobilized Anorganic Bovine Bone Matrix on Bone Regeneration

Effect of rhBMP-2 Immobilized Anorganic Bovine Bone Matrix on Bone Regeneration

International Journal of Molecular Sciences, 2015

Anorganic bovine bone matrix (Bio-Oss®) has been used for a long time for bone graft regeneration... more Anorganic bovine bone matrix (Bio-Oss®) has been used for a long time for bone graft regeneration, but has poor osteoinductive capability. The use of recombinant human bone morphogenetic protein-2 (rhBMP-2) has been suggested to overcome this limitation of Bio-Oss®. In the present study, heparin-mediated rhBMP-2 was combined with Bio-Oss® in animal experiments to investigate bone formation performance; heparin was used to control rhBMP-2 release. Two calvarial defects (8 mm diameter) were formed in a white rabbit model and then implanted or not (controls) with Bio-Oss® or BMP-2/Bio-Oss®. The Bio-Oss® and BMP-2/Bio-Oss® groups had significantly greater new bone areas (expressed as percentages of augmented areas) than the non-implanted controls at four and eight weeks after surgery, and the BMP-2/Bio-Oss® group (16.50 ± 2.87 (n = 6)) had significantly greater new bone areas than the Bio-Oss® group (9.43 ± 3.73 (n = 6)) at four weeks. These findings suggest that rhBMP-2 treated heparinized Bio-Oss® markedly enhances bone regeneration.

Research paper thumbnail of Morphological Characteristics of the Topshell in the Jeju Coastal Waters

Morphological characteristics of the topshell, Turbo cornutus Solander were studied on the basis ... more Morphological characteristics of the topshell, Turbo cornutus Solander were studied on the basis of shell growth and fatness from April 1978 to October 1979. The Sampled areas were coastal waters of Jeju City, Seongsanpo, Moseulpo and Seogwipo in Jeju. The average shell length of the topshell from Jeju City area was smaller than those of the other three areas, and also the spine number of the 1st row on the shell from Jeju City area was fewer than the others. Sex ratios from each areas represented about 1:1. The relationship between shell length and shell breadth showed regression line and the value of slope for the specimen from Seongsanpo was the lowest. The relationship between shell length and total weight showed exponential curve, and the value was the highest in the specimens from Moseulpo. The value of slope on the relationship between total weight and meat weight was the highest in those from Moseulpo and the lowest from Jeju City. The regression line of relationship between...

Research paper thumbnail of Dietary Squid Liver Powder (SLP) with Dehulled Soybean Meal (DHSM) as a Fish Meal (FM) Substitute for Olive Flounder, Paralichthys olivaceus

Dietary Squid Liver Powder (SLP) with Dehulled Soybean Meal (DHSM) as a Fish Meal (FM) Substitute for Olive Flounder, Paralichthys olivaceus

Research paper thumbnail of Evaluation of Dietary Squid Liver Powder-Soy Protein Concentrate Premix as a Fish Meal Substitute for Juvenile Olive Flounder, Paralichthys olivaceus

This study was conducted to investigate the effects of dietary propolis supplementation on growth... more This study was conducted to investigate the effects of dietary propolis supplementation on growth performance, immune responses, disease resistance and body composition of juvenile eel, Anguilla japonica, in order to evaluate its bioavailability as a feed additive for this species. A total of 540 fish averaging 7 .7 * 0.22 g (mean + SD) were randomly distributed into 18 tanks in groups of 30, and each tank was then randomly assigned to one of three replicates of six diets containing 0 (P0), 0.25 (Po.zs), 0.5 (Pg.s), 1.0 (P1), 2.0 (P2) and 4.0 (P4) Vo dietary propolis. At the end of 12 weeks of feeding trial, weight gain (WG), specific growth rate (SGR), feed efficiency (FE) and protein efficiency ratio (PER) of fish fed P6.5 diet were significantly higher than those of fish fed Pe, Pr, Pz and Pa diets (P < 0.05). These parameters were 148.97o, 0.727o duy-t, 94.4Vo and 2.9, respectively for fish fed Pe.5 diet. Serum lysozyme activity of fish fed Ps.5 (105.7 units mJ--r) and P1 (106.0 units ml--l) diets were significantly higher than those of fish fed P6, Po.zs,Pz and Pa diets. Mucus lyscizyme activity of fish fed P1 (8.4 units 10 cm-2) diet was significantly higher than those of fish fed P6, P2 and Pa diets. Results indicated that the optimum dietary propolis supplementation levels could be 0.25{.5%o for optimum growth and feed efficiency, and 0.5-l7o for enhanced immune responses and disease resistance in eel, A. japonica. This study may suggest that the dietary propolis level for the optimum immune responses could be higher than the level for the optimum growth of eel.

Research paper thumbnail of Acute Toxicity of Synthetic Detergent on the Larvae of Loach, Misgurnus angillicaudatus

Short-term acute toxicity of synthetic detergent(LAS) to larvae of loach, Misgurnus angillicaudat... more Short-term acute toxicity of synthetic detergent(LAS) to larvae of loach, Misgurnus angillicaudatus was examined by static bioassay. The larvae were exposed to 15 different concentration of synthetic detergent for 16, 48, 72, 96 and 120 hours in order to determine median lethal concentration(). The mortarlity of larvae was showed within 120, 96, 48 and 16 hours for 6, 18, 30 and 38 ppm, respectively. The median lethal concentration values of the larvae were 12.59 ppm for 48 hours, 4.00 ppm for 96 hours and 1.02 ppm for 120 hours. The permissible toxicant concentration of acute toxicity to larvae was ppm, and application factor of the synthetec detergent was . The median lethal time() for different concentration also was determined. The of 0.2 ppm was found within 165.1 hours and 2 ppm was 106.2 hours, while the of 8 ppm was 60.3 hours and that of 38 ppm was 23.5 hours.

Research paper thumbnail of Compensatory Responses of Nile Tilapia Oreochromis niloticus under Different Feed-Deprivation Regimes

We investigated compensatory growth of Nile Tilapia Oreochromis niloticus in structural size and ... more We investigated compensatory growth of Nile Tilapia Oreochromis niloticus in structural size and live weight in response to different deprivation periods and refeeding. Four treatments were assigned randomly to fish in 12 glass tanks, with each treatment performed in triplicate. The control group was fed to satiation three times a day throughout the experiment. The other three treatment groups were starved for 1 week (S1), 2 weeks (S2), or 4 weeks (S4) and then fed until the end of the experiment. After the experiment, no significant differences were observed among S1, S2, and the control group in average weight or length, whereas the weight and length of S4 were significantly reduced. Relative condition factors of the three starved groups decreased significantly until the end of the restricted period but recovered rapidly after refeeding. The specific growth rate in weight () of the three restricted groups recovered quickly upon refeeding and were significantly higher than the cont...

Research paper thumbnail of Fish Community and Estimation of Optimal Ecological Flowrate in Up and Downstream of Hoengseong Dam

Fish Community and Estimation of Optimal Ecological Flowrate in Up and Downstream of Hoengseong Dam

In this study, a comprehensive field monitoring was conducted to understand habitat conditions of... more In this study, a comprehensive field monitoring was conducted to understand habitat conditions of fish species in up and downstream of Hoengseong Dam. Based on the monitoring data, riverine health conditions such as composition ratio of fish species, bio-diversity (dominance index, diversity, evenness and richness), index of biological integrity (IBI) and qualitative habitat evaluation index (QHEI) were assessed, and optimal ecological flowrates (OEF) were estimated using the habitat suitability indexes (HSI) established for three fish species Coreoleuciscus splendidus, Pungtungia herzi and Microphysogobio longidorsalis selected as icon species using the physical habitat simulation system (PHABSIM). The total number of species sampled was 20 species, and two species of Zacco platypus (30.4%) and C. splendidus (20.9%) dominated the fish community. As a result, it was revealed that IBI and QHEI values decreased from upstream to downstream along the river. The estimated IBI value range...

Research paper thumbnail of Effect of rhBMP-2 Immobilized Anorganic Bovine Bone Matrix on Bone Regeneration

Effect of rhBMP-2 Immobilized Anorganic Bovine Bone Matrix on Bone Regeneration

International journal of molecular sciences, 2015

Anorganic bovine bone matrix (Bio-Oss®) has been used for a long time for bone graft regeneration... more Anorganic bovine bone matrix (Bio-Oss®) has been used for a long time for bone graft regeneration, but has poor osteoinductive capability. The use of recombinant human bone morphogenetic protein-2 (rhBMP-2) has been suggested to overcome this limitation of Bio-Oss®. In the present study, heparin-mediated rhBMP-2 was combined with Bio-Oss® in animal experiments to investigate bone formation performance; heparin was used to control rhBMP-2 release. Two calvarial defects (8 mm diameter) were formed in a white rabbit model and then implanted or not (controls) with Bio-Oss® or BMP-2/Bio-Oss®. The Bio-Oss® and BMP-2/Bio-Oss® groups had significantly greater new bone areas (expressed as percentages of augmented areas) than the non-implanted controls at four and eight weeks after surgery, and the BMP-2/Bio-Oss® group (16.50 ± 2.87 (n = 6)) had significantly greater new bone areas than the Bio-Oss® group (9.43 ± 3.73 (n = 6)) at four weeks. These findings suggest that rhBMP-2 treated heparin...

Research paper thumbnail of Effects of Dietary Arachidonic Acid (20:4n-6) Levels on Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica

Effects of Dietary Arachidonic Acid (20:4n-6) Levels on Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica

Asian-Australasian Journal of Animal Sciences, 2010

ABSTRACT This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-... more ABSTRACT This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-6) levels on growth performance and body composition in juvenile eel, Anguilla japonica. Six semi-purified experimental diets were formulated to be isonitrogenous and iso-caloric containing 55.0% crude protein and 15% crude lipid (18.3 kJ of available energy ). Six different levels of AA were added to the basal diet, with 0, 0.2, 0.4, 0.6, 0.8 or 1.2% on a dry matter (DM) basis, respectively (). After a conditioning period, fish initially averaging 270.5 g (meanSD) were randomly distributed into each aquarium as triplicate groups of 20 fish each. One of six experimental diets was fed on a DM basis to fish in three randomly selected aquaria at a rate of 2-3% of total body weight twice a day. At the end of the 12-week feeding trial, weight gain (WG) and feed efficiency (FE) of fish fed and diets were significantly higher than of fish fed diets (p

Research paper thumbnail of Body composition and compensatory growth in Nile tilapia Oreochromis niloticus under different feeding intervals

Body composition and compensatory growth in Nile tilapia Oreochromis niloticus under different feeding intervals

Chinese Journal of Oceanology and Limnology, 2015