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양상근 ( Sang Geun Yang ),조용철 ( Yong Chul Cho ),양현 ( Hyun Yang ),강언종 ( Eon Jong Kang ) 한국환경생물학회 2012 환경생물 : 환경생물학회지 Vol.30 No.1
Abstract - From April to November 2009, we performed field investigation to survey the characteristics of fish fauna and fish community structure inhabited in Yongdam reservoir in the upper Geumgang, which is changed into flat-water zone from flow-water zone by blocking the continuity by the gigantic submerged weir built in the upstream of Geumgang. 15 species belonging to 8 families were collected from natural habitat (St. 1) where its natural characteristics is well preserved, and 11 species were korean endemic fish species. 24 species belonging to 10 families were collected at the down region of Yongdam dam (St. 3), which might be affected by the change of water environment due to the dam, and 11 species were korean endemic fish species. On the other hand, 20 species belonging to 7 families were collected inside Yongdam reservoir (St. 2) which is changed into flat-water zone from flow-water zone by the dam reservoir, and 6 species were korean endemic fish species. In the dam reservoir, due to Yongdam dam built in the upper Geumgang, the original flow-water zone fish such as Acheilognathus koreensis, Pseudopungtungia nigra, Coreoleuciscus splendidus, and Gobiobotia macrocephala were disappeared, and instead, the kinds of fish habitating in the flat-water zone tend to increase rapidly, such as Carassius auratus, Opsarichthys uncirostris amurensis, Hemiculter eigenmanni, Zacco platypus, and Lepomis macrochirus. Relative abundance of the insective fish was 66.7% at St. 1, 40.0% at St. 2, and 54.2% at St. 3. In order to preserve endemic fish species and aquatic ecosystem, it is desirable to minimize the artificial installation in the upper river, such as a large scale dam which can affect the habitat and if inevitable, it is required to prepare preservation measures when building facilities.
수온, 광조건 및 밀도에 따른 자바리 (Epinephelus bruneus)의 산소소비 특성
양상근 ( Sang Geun Yang ),지승철 ( Seung Cheol Ji ),문태석 ( Tae Seok Moon ),김경민 ( Kyung Min Kim ),정민환 ( Min Hwan Jeong ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.2
This study investigated the effects of water temperature, photoperiod and population density on oxygen consumption (OC) in the long tooth grouper (Epincphelus bruneus). DC` rate in the longlooth grouper at 15, 20, and 25°C were 85.9±6.9, 107.5±10.1, and 164.0±19.2 mg O2kg-1h1, respectively, indicating a linear increase in OC with water temperature. Photoperiod was regulated in accordance with the light (09:00-21:00 h. L) and dark (21:00-09:00 h, D) phases of the did cycle (12L/12D), with a water temperature of 15, 20, or 25°C`. DC` rates during the light and dark phases were 83.8±5.4.88.1±7.8mg 00 kg-1 h-1, respectively, at 15°C and 111.2±12.3 and 103.7±5.7 mg O, kg-1 h-1 at 20°C. No significant differences were observed between the light and dark phases (P> 0.05). at 25°C the OC rates were 168.8±24.3 and 159.2±11.4mg O2 kg-1 h-1 during the light and dark phases. respectively, indicating that DC. is higher during daylight than nighttime. OC tates at 55.4, 88.4. 118.8, and 145.1 g L-1 were 252.0±11.6, 219.0±8.7, 206.7±11.4, and 208.8±11.4 mg O2, kg-1h-1, respectively, indicating a decrease in DC with increasing population density. However, no significant difference was observed between the values for 118.8 g L and 145.1 g L (P> 0.05).
사육밀도와 수온에 따른 자바리( Epinephelus bruneus )의 적응특성
양상근 ( Sang Geun Yang ),지승철 ( Seung Cheol Ji ),문태석 ( Tae Seok Moon ),손맹현 ( Maeng Hyun Son ),김경민 ( Kyong Min Kim ),허성표 ( Sung Pyo Hur ),이치훈 ( Chi Hoon Lee ),이영돈 ( Young Don Lee ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.6
The aim of this study was to investigate the effects of stocking density and water temperature in the rearing of the longtooth grouper Epinephelus bruneus . Juvenile fish [mean body weight (BW)=6.9±1.1 g] were raised for 6 weeks, in four density groups of 0.25, 0.5, 0.75, and 1 individuals/L. There were no significant differences in weight gain (WG) or specific growth rate (SGR) among the density groups; however, both WG and SGR tended to be higher in the low density group. After 6 weeks of rearing in temperature-controlled water (23.6±0.8°C) and ambient temperature water (19.6±1.8°C), there were no significant differences in WG or SGR values, but both tended to be higher in the temperature controlled water. The feed efficiency (FE) and daily feed intake (DFI) and WG values were also higher in the temperature-controlled water than in the ambient temperature water. WG values were lower at lower water temperatures. The same pattern was observed for SGR, FE, and FI, all of which exhibited lower values at lower temperatures. In particular, WG, SGR, and FE values all tended to decrease at the 16°C water temperature. The effects of water temperature on 1-year fish (mean BW = 387.6±30.2 g) and 3-year fish (mean BW = 1,338.3±73.8 g) were similar to those of the juvenile fish (0-year fish).
인공사육에 의한 멸종위기종 꼬치동자개(Pseudobagrus brevicorpus)의 성장과 성성숙 특성
양상근 ( Sang Geun Yang ),강언종 ( Eon Jong Kang ),김광석 ( Kwang Seog Kim ),방인철 ( In Chul Bang ) 한국환경생물학회 2009 환경생물 : 환경생물학회지 Vol.27 No.4
멸종위기에 처한 꼬치동자개(Pseudobagrus brevicorpus)의 보전과 복원을 위한 기초 자료를 제공하기 위하여 인공사육 환경에서 사육된 종묘에서 친어까지의 성장과 성성숙 특징들을 조사하였다. 부화 후 698일의 인공사육 기간 동안 전장과 체중은 각각 89.22±10.29mm와 70.93±7.68 g로 성장하였고, 전장 (TL)과 체중(BW)의 관계는 BW=5×10(-5) TL2.678 (R2=0.995)로 나타났으며, 생존율은 74.2%였다. 암컷과 수컷의 성비는 1(암컷, 471):1(수컷, 473)이었다. 부화 후 663일째에 암컷의 전장과 체중은 각각 78.38±0.92 mm과 6.38±0.20 g로 나타나 수컷의 87.44±1.07mm와 8.43±0.31 g에 비해 높았으나, 비만도는 암컷이 수컷에 비해 유의적으로 높은 값을 보였다(P<0.05). 암컷 1마리당 포란수는 평균 734개(508~867개)였고, 난경은 0.04~1.65mm의 범위를 보였다. 인공 사육된 친어는 만 2년이 되던 6월 초순에 인간 융모성 고나도트로핀(human chorionic gonadotropin: HCG)을 주사한 후 1~2일 사이에 산란이 가능하였고, 부화된 개체는 평균 216마리(113~338마리)였다. The stumpy bullhead (Pseudobagrus brevicorpus) endemic to Korea is one of critically endangered freshwater fish species. To provide baseline data for its captive breeding and reintroduction we investigated basal characteristics on its growth and sexual maturation in an artificial rearing environment. After 698-day rearing the stumpy bullhead grew up to 89.22±10.29 mm in total length (TL) and 70.93±7.68 g in total body weight (BW)(BW=5×10(-5) TL2.678; R2=0.995), and showed survival rate of 74.2%. The sex ratio was 1 (471 females): 1 (473 males), and males (TL=87.44±1.07mm; BW=8.43±0.31 g) showed significantly faster growth than females (TL=78.38 ±0.92mm; BW=6.38±0.20 g) after 663-day rearing. However, condition factor of females was significantly higher than that of males (P<0.05). The number of eggs per female ranged from 508 to 867 (average 734), and their diameters ranged from 0.04 to 1.65 mm. The females which reared about two years in the laboratory condition was able to spawn in the early June after 1~2 days of human chorionic gonadotropin (HCG) injection. The number of hatched fries ranged from 113 to 338 (average 216).
고체산화물 연료전지용 연로ㆍ물 직접 분무식 촉매 개질기에 관한 실험적 연구
이대근(Dae Keun Lee),동상근(Sang Geun Dong),양제복(Je Bok Yang),김학주(Hak Joo Kim),정헌(Heon Jumg) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study on the catalytic reformer adopted in the auxiliary power unit system of solid oxide fuel cell was conducted. A 3-fluid nozzle, by which liquid fuel such as diesel, water and air are sprayed and uniformed mixed, was designed and used in this study. An electrically heated monolith inserted in the reformer was used for the vaporization of fuel and water in the transient state of reformer. The reformer uses the partial oxidizing reaction at the catalyst and the supply of water prevents the flame combustion in the spraying zone and lessens the deactivation of catalyst. The result showed that the reforming of liquid fuel can be started by the electrically heated monolith and the 3-fluid nozzle can give the uniform mixing of fuel, water and air. It was also found that the reformer fueled by n-hexadecane can make the reformate, at best, containing H₂ at 15.5% and CO at 11.5% that are used as fuel in the solid oxide fuel cell.