• Journal of the Korean Association of Geographic Information Studies
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• v.9 no.1
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• pp.168-178
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• 2006

In recent years, an ingress of mass jellyfish into cooling water intake system causes interruption of electric power production at the Uljin nuclear power plant. Therefore, monitering and forecast on the mass ingress of marine organisms are demanded as one of the early preventing measurements. Sea water movement is a major factor on the ingress of marine organisms like Moon jellyfish which has weak self-mobile ability. When sea surface flow direction adjacent to the Uljin is the northwest, the jellyfish on the Tsushima warm currents move to the Uljin power plant. To detect the direction of sea surface warm flows, the spatial range with $25km{\times}25km$ is set up and NOAA sea surface temperature(SST) data are collected in this area. For the statistical analysis, the SST data are made as GIS point data and geostatistical analysis of ArcGIS is used. Analyzing directional semivariogram, the anisotropy of the SST point data are calculated and warm flow direction is detected. This experimental results are expected to use as an element technology for the early warning system development of mass jellyfish ingress in power plant.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2004.10a
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• pp.48-52
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• 2004

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2010.05a
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• pp.49-52
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• 2010

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2009.05a
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• pp.159-162
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• 2009

• Journal of the Korean Professional Engineers Association
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• v.43 no.1
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• pp.46-49
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• 2010

Sea temperature rise by global warming, depletion of fishery resources and ocean pollution have caused unusual population explosion of the jellyfish, The blooming of jellyfish have brought social problem and economic damage, Therefore the interdisciplinary study of jellyfish by scientists and countermeasure are needed.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2010.05a
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• pp.219-222
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• 2010

여수 연안 소형 정치망 2곳에 있어서 혼획과 투기에 대하여 2007년부터 2010년까지 26회의 조사를 실시하였다. 매년의 조업 일수는 어황이나 해황에 따라 변동이 심했으며, 최근에는 여름과 가을철에 해파리 때문에 조업을 포기하므로서 조업일수가 많지는 않았다. 어획된 전체 어종수는49종이었고, 어획후 전량투기되는 어종수는 7종(2007년)으로 나타났다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.319-320
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• 2001

최근 서해안을 중심으로 한 한반도 주변해역에서 하계에 해파리류가 급증하면서 연안어장 및 생태계에 심각한 영향을 미치고 있는 실정이다. 우리나라 연안에서 우점하는 물해파리(Moon jellyfish: Aurelia aurita)는 전세계적으로 분포하는 종이며, 인체에 해를 미치는 유해한 종은 아니나 멸치와 같은 소형어류의 어장에 막대한 영향을 미치고 있는 실정이다. 물해파리는 소형일 때는 동물플랑크톤 중 요각류나 소형 갑각류를 먹다가 성장하면서 소형어류를 먹는 것으로 밝혀져있다( Purcell, 1985; sullivan et al., 1994). (중략)

• Journal of Fisheries and Marine Sciences Education
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• v.27 no.6
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• pp.1755-1763
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• 2015

The objective of this study is to empirically analyze the relationship between sea temperature and jellyfish blooms. Ever since the 2000s, jellyfish population has been dramatically increased, which brought negative influence on the national health and the fisheries activities. Jellyfish blooms have been recognized as an effect of climate change, but there has been no empirical evidence to support such relationship. In this paper, the relationship between sea temperature and jellyfish blooms has been analyzed by using the regional jellyfish monitoring data and coastal stationary observing data of National Institute of Fisheries Science. Since the dependant variable carries left censoring issues, we used the panel tobit model. Our results indicate that there are statistically significant positive relationship between sea temperature and jellyfish blooms.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2010.05a
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• pp.223-226
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• 2010

여수 연안 정치망의 어획 특성을 파악하기 위한 본 조사는 2007년 11월부터 2008년 11월 사이에 전남 여수시 돌산도, 금오도, 안도 및 연도 연안의 정치망어장에서 실시되었다. 조업기간은 대부분 4월부터 11월까지 였으며, 겨울철에는 휴어하였다. 조사기간 동안 표층 수온의 범위는 $13.4{\sim}26.5^{\circ}C$였으며, 10m층의 수온범위는 $13.9{\sim}26.5^{\circ}C$로 나타났다. 어획어종의 수는 8~35종으로 나타났는데 해파리가 입망되는 시기에 어획어종의 수가 적어졌다. 어획량이 많았던 어종은 고등어, 삼치, 병어 등으로 나타났다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.49 no.4
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• pp.483-491
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• 2013

The sound-speed and density contrasts are important factors in estimating the target strength (TS) of moon jellyfish (Aurelia aurita). In this study, the sound-speed and density contrasts were measured using time-of-flight and neutral buoyancy methods, respectively. The sound-speed contrast of A. aurita was from 0.9966 to 1.0031 (mean${\pm}$SD, $0.9999{\pm}0.0017$) and no distinct differences in temperature or pulsation activity and weak were found. The density contrast was from 0.9994 to 1.0004 (mean${\pm}$SD, $1.0000{\pm}0.0002$). The density of A. aurita was substantially different but the density contrast of A. aurita was shown to be similar to that in the sampling location. The results can be used to estimate of TS of A. aurita by acoustic model.