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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.
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).
부시리 Seriola lalandi 종자생산을 위한 생물학적 특성
양상근(Sang-Geun YANG),김정현(Jung-Hyun KIM),김효원(Hyo-Won KIM),안철민(Cheul-Min AN),지승철(Seung-Cheol JI),정민환(Min-Hwan JEONG),명정인(Jeong-In MYEONG),이영돈(Young-Don LEE),김대중(Dae-Jung KIM) 한국수산해양교육학회 2018 水産海洋敎育硏究 Vol.30 No.5
This study aimed to increase the survival rate of yellowtail kingfish (Seriola lalandi) larvae. We investigated, from hatching to the breeding period, the growth and survival rate of larvae as well as the the survival rate upon starvation, yolk resorption, mouth opening time, and change in mouth size. The survival activity index (SAI) of larvae at water temperatures between 20 and 28℃ ranged from 9.2 to 0.9, increasing with low temperatures (p<0.05). Furthermore, the yolk and oil globule resorption time reduced with elevated temperatures. Thus, the time taken to resorb 95% of the yolk was 72 and 84 hours after hatching at water temperatures of 24℃ and 20 to 22℃, respectively. The time of onset of larval mouth opening (y) showed a linear relationship with water temperature (x) that may be represented as: Y = -12.5X + 82 (r² = 0.959). The correlation between the total length (x) and upper jaw length (y) of the larvae also exhibited a linear relationship, from the onset of mouth opening behavior until 96 hours after and at a water temperature of 22℃, expressed as the equation: y = 0.069x (r² = 0.778). In addition, 72 hours after hatching, the upper jaw length was 0.259 ± 0.039 ㎜; rotifer feed was found in the intestinal tract of larvae from this time point on. Moreover, the total length and survival rate (both 60 days after hatching [DAH]), the annual growth rate (AGR), and specific growth rate (SGR) were 113.79 ±14.74 ㎜, 9.1%, 18.53 ㎜ per day, and 5.48% per day, respectively. Little growth was observed from hatching to 20 DAH; however, the growth rate gradually increased from 20 DAH, until the larvae rapidly grew post 30 DAH.
Jung-Ha Kang(강정하),Sang-Geun Yang(양상근),Eun-Mi Kim(김은미),Eun-Soo Noh(노은수),Dong-Gyun Kim(김동균),Bong-Seok Kim(김봉석),Tae-Jin Choi(최태진) 한국생명과학회 2015 생명과학회지 Vol.25 No.1
참돔과 감성돔은 우리나라 주변에 서식하는 고유 어종으로, 참돔의 암컷과 감성돔의 수컷을 이용한 인공수정에 의하여 잡종은 생산되었으나, 자연 상태에서는 이들 간의 잡종이 보고된 바 없다. 이들 두 어종의 암수 및 타 어종을 섞어서 대형 수조에서 사육하는 과정에서 생산된 수정란을 회수하여 부화시켜 육성하는 과정에서 이들 두 종간의 잡종의 형태를 보이는 개체들이 관찰되었다. 임의로 96개체를 선택하여 두 종에 모두 적용할 수 있는 microsatellite marker를 이용하여 유전학적 분석을 실시한 결과 96개체 중 두 종의 혼합된 형태적 특징을 보이는 15개체는 참돔 암컷과 감성돔 수컷 간의 잡종으로 판명되었으며, 나머지 81개체는 감성돔 치어로 확인되었다. 사육수조의 크기가 매우 컸으며 다른 어류들도 함께 들어 있었다는 점과, 이와 같이 유전적으로 구분되는 두 종 간의 잡종이 자연상태와 유사한 환경에서 생산되었다는 점을 고려할 때 본 연구의 결과는 자연 상태에서도 인위적인 영향이나 기후 변화에 의하여 이들의 서식지가 중복될 경우 두 종간의 잡종이 생산될 가능성이 있다는 것을 시사한다. During the storage of these two species in a large conservation tank, fertilized eggs were collected and the offspring were raised. During culturing of the offspring, individuals with mixed characteristics of these two species were observed, and 96 individuals were randomly tested using microsatellite markers applicable to both species. Among the 96 individuals, 15 individuals with mixed morphological characteristics were confirmed to be hybrids showing both of genotypes red seabream and blackhead seabream. Additionally, based on sequence analysis of mitochondrial cytochrome oxidase subunit 1 (mtDNA CO1), 81 showed 99% nucleotide sequence identity to that of black sea bream, and the remaining 15 individuals showed over 99% sequence identity to that of red seabream. So, hybrids were produced by female red seabream and male blackhead seabream. These results suggest that hybrids may form in nature between these two species if their habitats overlap due to the influence of humans or global climate change.
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.