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RISS 인기검색어
- 검색키워드
- 저자 : Jun Wook Hur (검색결과 229 건)
- 무료
- 기관 내 무료
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Hur, Jun Wook,Gil, Hyun Woo,Park, In-Seok The Korean Society of Marine Life Science 2018 한국해양생명과학회지 Vol.3 No.2
To investigate effects of starvation on physiological changes, stress response, and survival of cobitid loach (Misgurnus anguillicaudatus) exposed to sodium nitrite (NaNO<sub>2</sub>), a 4-week experiment was conducted. Fewer fish survived in the starved group than those in the fed group during the experiment. Starvation resulted in growth retardation, leading to differences in body length and body depth between fed and starved groups. The fed gorup continued to grow and remained in good condition. Blood chemical analysis (plasma cortisol and glucose) showed significant differences in stress response to nitrite exposure between fed and starved groups (p < 0.05). These results suggest that all parameters employed in this study to assess effects of starvation with NaNO<sub>2</sub> stress are useful information for researching nutritional status in cobitid loach.
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Physiological Responses to Three Different Levels of Vibration Stress in Catfish, Silurus asotus
Jun Wook Hur,Dae Hee Kim,Jeong-Yeol Lee 응용생태공학회 2015 Ecology and resilient infrastructure Vol.2 No.4
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<SUP>+</SUP>, K<SUP>+</SUP> 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.
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Physiological Responses to Three Different Levels of Vibration Stress in Catfish, Silurus asotus
Hur, Jun Wook,Kim, Dae Hee,Lee, Jeong-Yeol Korean Society of Ecology and Infrastructure Engin 2015 Ecology and resilient infrastructure Vol.2 No.4
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.
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Hur, Jun Wook,Gil, Hyun Woo,Park, In-Seok Korean Society of Ecology and Infrastructure Engin 2018 Ecology and resilient infrastructure Vol.5 No.4
The experiment was conducted to investigate the effects of various dietary conditions on external morphometric traits, and sectioned morphometric traits in the cultured cyprinid loach, (Misgurnus anguillicaudatus) for 28 days. For the fed group there was an increase in body weight, standard length, and morphometric dimensions of the head and body cavity regions compared with the starved and initial groups. Sectioned morphometric trait analysis revealed that relative to the starved group, the fed group had greater body circumference, cross-sectional area, and total height (P<0.05). Our results provide data on external and sectioned morphometric changes under starvation conditions, and can be used as a guide to assist in the regulation and scheduling of feeding, and as indices of the nutritional status of cyprinid loach.
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Assessment of Physical Habitat and the Fish Community in Korea Stream
Jun Wook Hur,Jin Chul Joo,Byungwoong Choi 응용생태공학회 2022 Ecology and resilient infrastructure Vol.9 No.1
The purpose of this study is to provide essential data necessary to assess ecological flow requirements by understanding habitat conditions for fish species through monitoring an ecological environment in the Korea stream (Dal Stream) and building related database. On-site surveys were conducted for identifying ecological and habitat conditions at the four monitoring sites. Fish sampling was carried out at the selected four sites (St.) during the period ranging from September, 2008 to September, 2009. At the four sampling sites, we measured water surface elevation, depth and velocity at the cross-sections. Optimal Ecological Flowrates (OEFs) were estimated using the Habitat Suitability Index (HSI) established for four fish species Zacco koreanus (St.1), Pungtungia herzi (St.2), Coreoleuciscus splendidus (St.3), and Zacco platypus (St.4) selected as icon species using the Physical HABitat SIMulation system (PHABSIM). Eighteen species (56.3%) including Odontobutis interrupta, Coreoperca herzi and C. splendidus were found endemic out of the 32 species in eight families sampled during this study period. The endangered species was collected Acheilognathus signifier, Pseudopungtungia tenuicorpa and Gobiobotia macrocephala, and this relative abundance was 9.4%. The most frequently found one was Z. platypus (31.3%) followed by C. splendidus (17.6%) and Z. koreanus (15.7%). The estimated IBI values ranged from 27.3 to 34.3 with average being 30.3 out of 50, rendering the site ecologically poor to fair health conditions. For C. splendidus (St.3), the dominant fish species in the stream, the favored habitat conditions were estimated to be 0.3-0.5 m for water depth, 0.4-0.7 m/s for flow velocity and sand-cobbles for substrate size, respectively. An OEFs of 8.5 m3/s was recommended for the representative fish species at the St.3.
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Jun Wook Hur,Hyun Woo Gil,In-Seok Park 응용생태공학회 2018 Ecology and resilient infrastructure Vol.5 No.4
The experiment was conducted to investigate the effects of various dietary conditions on external morphometric traits, and sectioned morphometric traits in the cultured cyprinid loach, (Misgurnus anguillicaudatus) for 28 days. For the fed group there was an increase in body weight, standard length, and morphometric dimensions of the head and body cavity regions compared with the starved and initial groups. Sectioned morphometric trait analysis revealed that relative to the starved group, the fed group had greater body circumference, cross-sectional area, and total height (P<0.05). Our results provide data on external and sectioned morphometric changes under starvation conditions, and can be used as a guide to assist in the regulation and scheduling of feeding, and as indices of the nutritional status of cyprinid loach.
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양식장에서 사육하는 메기 (Silurus asotus)의 산소소비 및 암모니아 배설에 미치는 소음진동 영향
허준욱(Jun Wook Hur),이정열(Jeong Yeol Lee),주진철(Jin Chul Joo) 응용생태공학회 2018 Ecology and resilient infrastructure Vol.5 No.2
진동 스트레스에 따른 양식 메기 (Silurus asotus)의 산소소비량 및 암모니아 배설량을 분석하였다. 연구에 사용된 메기의 평균전장은 22.9 ± 0.9 cm (± SD, n = 30), 평균체중은 100.7 ± 11.7 g (± SD, n = 30) 이었다. 진동 자극은 특수 제작한 진동기를 이용하여 48, 58 및 68 dB (V)이었으며, 이때의 소음은 77.6 ± 1.8 dB (A) 크기를 주었다. 진동은 타임머를 이용하여 주간(08:00-18:00)에 15분 간격으로 11일간 계속하여 스트레스를 가하였다. 메기의 산소소비량 변화는 58 dB (V) 그룹에서 진동 후 1, 5, 9 및 11일째에 각각 21.8, 30.2, 36.0 및 53.2% 감소하는 것으로 나타났다. 68 dB (V) 그룹에서는 1, 7, 및 11일째에 각각 22.7, 35.1 및 57.7% 감소하였다. 48, 58 및 68 dB 그룹에서 진동 자극 경과일수(D)에 따른 식은 각각 직선식으로 OC=0.374D + 90.762 (r² = 0.048), OC = -3.581D + 89.520 (r² = 0.831) 및 OC = -4.109D + 90.907 (r² = 0.884)이었다. 암모니아 배설량은 48, 58 및 68 dB (V) 그룹에서 진동후 1일째에 각각 34.8, 51.8 및 63.2% 감소하는 것으로 나타났다. 48 및 58 dB (V) 그룹은 진동 3일째부터 11일째까지 유의한 차이를 보이지 않았다. 반면 68 dB (V) 그룹은 1, 3, 5, 7, 9 및 11일째에 진동전(0일째)과 비교하여 유의하게 감소한 것으로 나타났다. 진동 48 dB, 58 dB 및 68 dB에서의 진동 경과 일수에 대한 암모니아배설량 감소율은 직선식으로 각각 AE=-1.646D + 115.915 (r²=0.265), AE = -8.230D + 122.132 (r² = 0.750) 및 AE = -7.086D + 123.690 (r² = 0.614)로 나타났다. The main objective of this investigation was to examine oxygen consumption and ammonia excretion within cultured catfish, Silurus asotus (22.9 ± 0.9 cm, 100.7 ± 11.7 g n = 30) by noise and vibration stress in aquaculture farm. The vibration of 48, 58 and 68 dB (V) and noise of 77.6 ± 1.8 dB (A) from an electric vibrator was turned on for 15 minutes during each hour each day(0800-1800) for 11 days experimental period. The oxygen consumption (OC) of S. asotus the beginning of the experiment (0 day) in 58 dB group after 1, 5, 9 and 11 days was decreased 21.8, 30.2, 36.0 and 53.2%, respectively. In 68 group after 1, 7 and 11 days was decreased 22.7, 35.1 and 57.7%, respectively. The OC decreased exponentially and the relationship between them was expressed as OC = 0.374D + 90.762 (r² = 0.048) at 48 dB, OC = -3.581D + 89.520 (r² = 0.831) at 58 dB and OC = -4.109D + 90.907 (r² = 0.884) at 68 dB. Ammonia excretion (AE) of the beginning of the experiment in 48, 58 and 68 groups after 1 day was increased by 34.8, 51.8 and 63.2%, respectively, but it was decreased significantly from 3 to 11 days. The AE increased exponentially and the relationship between them was expressed as AE = -1.646D + 115.915 (r² = 0.265) at 48 dB, AE = -8.230D + 122.132 (r² = 0.750) at 58 dB and AE = -7.086D + 123.690 (r² = 0.614) at 68 dB.
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한강수계 달천의 어류상과 물리적 서식지 조건에 관한 연구
허준욱(Jun Wook Hur),강형식(Hyoeng Sik Kang),장민호(Min Ho Jang) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.8
하천복원과 환경유량을 위한 기초자료를 확립하고자 한강수계중 달천에서 어류상, 군집구조 및 물리적 서식조건을 2008년 9월부터 2009년 11월까지 조사하였다. 5개지점을 선정하여 실시된 어류 채집결과 총 9과 35종 2,089개체가 포획되었으며, 이중 한국고유종은 줄납자루 및 참종개를 포함하는 총 19종(54.3%)이 출현하였다. 출현어종중 개체수 구성비가 가장높은 종은 피라미로 30.3%를 차지하였고, 다음은 쉬리 18.0%, 참갈겨니 13.0 등의 순으로 나타났다. 어류군집은 상류로부터 하류로 내려갈수록 어종수가 증가되는 것으로 나타났으며, 생물다양도는 양호상태를 나타내었다. 집괴분석은 0.63 수준에서 2개의 그룹으로 나누어졌다. 우리나라 대부분 상류하천은 여울과 유수역이 반복되면서 이어지는 형태를 보여주고 있으나, 무분별한 하천사업 및 직강화·수로화 공사로 인해 하천의 서식지 다양성이 계속 감소되고 있는 추세이다. 따라서 생물다양성을 유지하고 생태적 하천복원을 위해서는 각 어종에 대한 물리적 서식 조건을 자세하게 파악하여 서식지 조성에 필요한 노력을 해야 할 것이다. In order to establish fundamental data for stream restoration and environmental flow, we investigated fish fauna, community and physical habitat conditions in the Dal Stream of Han River Basin. Field monitoring including fish sampling was conducted from September 2008 to October 2009. A total number of fish caught in the 5 sites was 2,080 representing 9 families 35 species, and 19 species (54.3%) including Acheilognathus koreensis and Iksookimia koreensis were Korean endemic species during the study period. The most frequently found species in number was pale chub (Zacco platypus, 25.7%, n=632) followed by Coreoleuciscus splendidus (18.0%, n=375) and Z. koreanus (13.0%, n=272). The lower reach of Dal Stream was more abundance of species, high diversity, evenness and richness, and lower dominance index than those of the upper reach. According to the dendrogram established at 0.63 level of similarity rate, sampling stations were divided into 2 groups. Most of upper streams in Korea consist of riffles and runs that are repeatedly followed by another one. However, stream channelization and leveling have caused reduction of habitat diversity. Therefore, it is necessary to make an effort on stream rehabilitation with evaluation of physical habitat condition by indicator species in order to maintain biodiversity and perform ecological restoration.
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