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Use of the cast net for monitoring fish status in reservoirs distributed in the Korean peninsula
Yoon, Ju-Duk,Kim, Jeong-Hui,Lee, Hae-Jin,Jang, Min-Ho The Ecological Society of Korea 2015 Journal of Ecology and Environment Vol.38 No.3
Reservoirs consist of two different environments, the littoral and the pelagic zone, and different fishing gear is commonly used in each zone-gill nets in the pelagic zone and electrofishing in the littoral zone. However, an active fishing gear, the cast net, is normally used instead of electrofishing for scientific studies in South Korea. In order to estimate cast net effectiveness for determining fish status in reservoirs, the study was conducted at 15 reservoirs with two different fishing gears: a cast net in the littoral zone and gill nets in the pelagic zone. When combining catches of both gears, species richness increased substantially compared to using one gear only. There was a size difference in fish caught by each net, and small fish were predominantly caught with the cast net due to its small mesh size (7 mm). The combined length of six species, used for length-weight relationship analysis, collected with the cast net was smaller than that collected with gill nets (independent t-test, P < 0.05). In this study, cast net sampling provided sufficient data for the littoral zone, but not enough to identify the overall fish assemblage in studied reservoirs. Utilization of only one gear can therefore lead to substantial underestimation of fish status, and a combination of both gears is recommended for determining more reliable estimates of fish status in reservoirs.
Yoon, Ju-Duk,Kwon, Kwanik,Yoo, Jeongwoo,Yoo, Nakyung National Institute of Ecology 2021 국립생태원회보(PNIE) Vol.2 No.4
To understand restoration and conservation projects conducted in Korea for endangered freshwater fishes and amphibians/reptiles, information about Request for Protocols-related studies on restoration, breeding, and release were collected. Trends of studies were visualized via word clouds and VOSviewer program using a text mining technique. Analysis of restoration projects for endangered freshwater fishes elucidated that most research studies conducted to date were focused on genetics and release through captive breeding that could be classified into captive breeding and habitat environments. As for research projects related to amphibians/reptiles, monitoring projects had the highest number, followed by genetic, translocation, and monitoring studies. In addition, restoration projects for amphibians/reptiles included a large number of post-capture translocation projects. Thus, many projects were confirmed by public institutions rather than by the Ministry of Environment. Network analysis revealed that it was largely classified into capture, translocation, and Kaloula borealis. Based on these results, limitations, achievements, and challenges associated with projects conducted thus far are highlighted. Research directions for future restoration and conservation of endangered freshwater fishes and amphibians/reptiles in South Korea are also suggested.
New Establishment of International Animal Biosafety Level 3 Facility
Yoon Ju Cho,Young Ah Lee,Hyun Jhung Jhun,Ho Suk Ham,Young Duk Ju,Jin Soo Han 한국실험동물학회 2008 Laboratory Animal Research Vol.24 No.3
As the use of laboratory animals has increased in Korea, the need for new facilities has also grown. Today, the increased risk of handling infectious microorganisms of animals could lead to an increase in contamination of the laboratory environment and personnel. The World Health Organization (WHO) has recognized that biosafety is an important international issue; in response, the organization published the third edition of the Laboratory Biosafety Manual, 2004. More recently, the Public Health Agency of Canada published its own biosafety document, the third edition of Laboratory Biosafety Guidelines, in 2004. Additionally, the U.S. Department of Health and Human Services published the fifth edition of its Biosafety in Microbiological and Biomedical Laboratories in 2007. The National Institutes of Health, the Korea Centers for Disease Control and Prevention (KCDC) updated its Guideline for Laboratory Biosafety, concerning biosafety facilities, in May 2007. We analyzed the A-BL facilities in Canada, Australia, Japan, and the U.S.A. to compare them with our circumstances here in Korea. The Laboratory Animal Research Center of Konkuk University (KULARC) has recently established the Animal Biosafety Level-3 facility (ABL3). To ensure whether the KULARC’s A-BL3 facility was properly designed and built, we inspected it using a biosafety checklist to aid us in the process of uncovering latent defects in existing facilities, and we now believe that we have met the related guidelines. We are sure that this facility provides an excellent example to other institutions and organizations planning to build an A-BL3 facility.
수중 음향 측정방식을 이용한 금강 중,하류의 눈불개 이동성 평가
윤주덕 ( Ju Duk Yoon ),김정희 ( Jeong Hui Kim ),인동수 ( Dong Su In ),황은지 ( Eun Ji Hwang ),윤조희 ( Jo Hee Yoon ),이영준 ( Young Joon Lee ),장광현 ( Kwang Hyeon Chang ),장민호 ( Min Ho Jang ) 한국하천호수학회(구 한국육수학회) 2012 생태와 환경 Vol.45 No.4
Visual monitoring is hard to apply on fish because they are living in a water system. To overcome this problem, acoustic telemetry, which is effective for underwater monitoring, is often used for studying fish behaviors, such as movement distance, route and patterns. In this study, in order to monitor the movement pattern of Squaliobarbus curriculus (family Cyprinidae), we used acoustic telemetry and identified the home range and movement distances. A total of nine individuals were released at two different locations: one is at the estuary barrage (Sc1~~3) and the other is at the lower part of Baekjae Weir (Sc4~~9), located in Geum River. Approximately, a 70 km section from the estuary barrage was investigated. Fish, which were released at the estuary barrage, utilized up to 12.7 km upstream as home range from the release site. At the lower part of Baekjae Weir, most of the fish moved and stayed within a 7.2 km downstream area, except for Sc6, which moved 53.4 km (linear maximum distance from release site) downstream from the release site. Relatively small sized fish (Sc7~~9) did not show any movement. Accumulated movement distance significantly correlated with the standard length of S. curriculus (rs=0.715, p=0.03). Moreover, the standard length of moving fish was significantly larger than that of not moving fish (Mann- Whitney U test, p=0.024). Therefore, the movement distance of S. curriculus has been correlated with fish size; movement distance was increased with the standard fish length. Although the sample size of monitored fish was small, various meaningful data were collected by acoustic telemetry. Consequently, this technique could be a method available for effectively monitoring the behavior and ecology of native Korean and endemic species.
낙동강 중,하류 구간에서 수중 음향측정방식을 이용한 강준치의 이동성 평가
윤주덕 ( Ju Duk Yoon ),김정희 ( Jeong Hui Kim ),인동수 ( Dong Su In ),유재정 ( Jae Jeong Yu ),허문석 ( Moon Suk Hur ),장광현 ( Kwang Hyeon Chang ),장민호 ( Min Ho Jang ) 한국하천호수학회(구 한국육수학회) 2012 생태와 환경 Vol.45 No.4
Acoustic telemetry is used to obtain a relatively continuous record of fish movement. This method has several advantages for studying migrating fish populations that are moving from large rivers. The Nakdong River is the longest river in South Korea and the main stream has faced a change, which consists of the installation of the large weirs. In this study, we applied acoustic telemetry to monitor the movement pattern of Erythroculter erythropterus (family Cyprinidae) and identified home range and movement distance in the Nakdong River. A total of fourteen individuals were released at three different locations and around 80 km section from the estuary barrage was investigated. Eight individuals were tagged and released at estuary barrage (N02) utilized up to 15.9 km (home range) upstream from the release site as home range. Four individuals were tagged and released at Samrangjin (N07), most fish moved and stayed within 9.7 km (home range) downstream area, except E12, which did not show any movement. Two individuals were tagged and released at Changnyeong- Haman weir (N10), and all individuals migrated downstream from the release site. Especially, E14 recorded the longest accumulated detected distance, 36.7 km downstream during 32 days after release. There was no correlation identified between movement (accumulated detected distance and home range) and standard length (Spearman rank correlation, p¤0.05). Although, this technique could be an available method to monitor behavior and ecology of freshwater fish effectively, increment of number of receivers and tags are required for more detailed results of fish migration.