• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.39 no.2
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• pp.50-54
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• 2021

This study was conducted to investigate the status of carcasses of wild birds among natural monuments in Korea. In Korea, from 2016 to 2020, a total of 38 species and 5,036 individual carcasses of natural monuments were found. The year 2020 saw the highest numbers of species death with 34 and in 2019 the highest number was recorded with 1,095 individuals. In autumn, the largest number of species and the smallest number of individuals were confirmed dead. On the contrary, the smallest number of species and the highest number of individuals were confirmed dead in summer. The largest number of species died in November, and the largest number of individuals died in June. Kestrels accounted for about 20% of the total carcasses, making up the largest number, followed by eagle owls, brown hawk-owls, scops owls, goshawk, eagles and sparrow hawks. In spring and summer, domestic breeding species accounted for most of the carcasses and in winter, the proportion of overwintering individuals such as wooper swans and eagles increased. Reports of lost natural monuments are done by human and the status of the carcasses alone cannot inform the population characteristics of natural monuments when they stay in Korea. However, it is expected that the identified domestic population of strigiformes which has not been investigated in detail because they are nocturnal, and data on the status of carcasses of natural monuments in Korea will provide basic data for the protection of natural monuments.

• KOREAN POULTRY JOURNAL
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• v.42 no.1
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• pp.146-147
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• 2010

• KOREAN POULTRY JOURNAL
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• v.14 s.157
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• pp.66-69
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• 1982

상처를 통하여 본 병원체의 침입을 받으면 혈유를 따라 전신에 순환하며 패혈증 및 독성이 생겨 폐사를 가져오므로 철저한 위생관리를 요한다.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.24 no.1
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• pp.52-58
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• 1991

Mass mortality of Halocynthia roretzi has been occurred in culturing grounds of southern coast of Korea during the long period of summer drought and the unusal high water temperature in 1988. Especially Halocynthia roretzi was damaged severely in 2 years group. Therefore we verified these phenomena by observing the environmental factors of culturing grounds and by evaluating oxygen consumption rate in indoor experiment. In culturing grounds, the mortality rate was high in Namhae Mizo area where water temperature was the highest and the lowest in dissolved oxygen concentration as low as 3.76m/l in field observation. In indoor experiment, the higher the water temperature, the more mortality was occurred and the salinity above 30 had no effect on its mortality. In oxygen consumption rate experiment, the smaller needs more oxygen than larger one, i. e., oxygen demand per unit weight was higher in 2 years group than that of 3 years. The theoretical and the actual minimum oxygen demands(MOB) for preventing asphixation was 3.7ml/kg/h at $20^{\circ}C$ and 6.3ml/kg/h gat $25^{\circ}C$, But actual MOD was 4.3ml/kg/h at $25^{\circ}C$ in indoor experiment. It seemed that mass mortality of Halocynthia roretzi in summer was caused by metabolism disorder due to insufficient oxygen level influenced by the high water temperature and the high density of Halocynthia roretzi, which results in the paucity of oxygen especially in 2 years groups.

• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.5
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• pp.468-473
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• 2014

This study is unrefined ZnO, $TiO_2$ nanoparticles is expose M4 medium to search nanoparticle aggregation and Daphnia magna was any effect by immobilization and mortality. ZnO and $TiO_2$ nanoparticle powder-size is respectively 20 nm and 40 nm. but, M4 medium has about respectively as 1333 nm and 1628 nm, 40 to 70 times were agglomerated. Immobilization of ZnO and $TiO_2$ nanoparticles was influenced both time and concentration the higher to swimming of D.magna. Especially, The immobilization of D.magna in nano-ZnO is greater than that influence in nano-$TiO_2$. Mortality of ZnO nanoparticle is higher rate at long time and high concentration. $TiO_2$ nanoparticle observed mortality at 10ppm concentration after 72h. Consequently, when Nanoparticles is introduced into ocean. Particle size become grow. Additionally, aggregation be caused affect aquatic ecosystems.

• Journal of fish pathology
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• v.22 no.2
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• pp.155-162
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• 2009

The mass mortality of Korean rockfish, Sebastes schlegeli that occured at the fish farms in Tongyeong and Geoje City regions between late August and early September in 2006 was investigated. Sixty two fish showed no significant external symptoms except ulcerative lesions with reddish foci on the skin. From the internal observations and diagnosis results, some yellowish brown liver, intestine bleeding, atrophy and congestion in the abdominal cavity of the fish were found. In the gill, swelled filaments caused by foreign material accumulation and mucus secretion were observed. However, the main cause of the fish mass mortality in both sampling regions could be due to physiological weakness induced by significant change of water temperature causing by typhoon Wookong during the summer in 2006.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.34 no.3
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• pp.179-183
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• 2001

Shortnecked clam, Ruditapes philippinarum, is one of the very important shellfish produced in south-western coast of Korea. But it's ready to be polluted and have sand in flesh because it mainly inhabit in silt at the inside of coastal area. This study was carried out to obtain informations about the elimination of sand in shortnecked clam harvested from western coast of Korea. During rearing shortnecked clams in water tank, the elimination rates of sand from them at 6, 13, 23, $28^{\circ}C$ were 59.0, 88.2, 97.9, $96.1^{\circ}C$ after 48 hours, respectively. The sand was eliminated above $95^{\circ}C$ from the shellfish at 32,9 to $40\%_{\circ}$ of salinity after 48 hours. But the sand elimination from them was incomplete and inconsistent at 10 to 20 of salinity. The sand was eliminated rapidly at pH 1.9 to 9.0 however, its elimination was not effective at neutral or acidity range, It was found that the sand elimination was most effective at $23^{\circ}C, 35\%_{\circ}$ salinty and pH 9.0. Reasonable flow rate for sand eliminate in shortnecked clam was above 150 L/min./shellfish $m^3$ under both 3,000 and 4,000 L/shellfish $m^3$, and above 100 L/min,/shellfish $m^3$ under both 6,000 and 8,000 L/shellfish $m^3$ in water tank.

• Journal of fish pathology
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• v.19 no.1
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• pp.55-64
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• 2006

Rhabdovirus-like virus were isolated from the fry (15~30 days post hatching, dph) and rearing water of the snakehead fish Channa arga exhibiting mass mortality in spring of 2003 and 2004 in Korea. The isolates were propagated in EPC and SSN-1 cells but not replicated in FHM cells. The bullet-shaped viral particles (45×100 nm) appeared to be compact and a similar morphology to those of the rhabdoviruses in the infected EPC cells. The optimum temperature for virus replication was 20 to 25℃ but they could not replicate at 15℃. The isolates ShFRV-3 and ShFRV-5 from snakehead fish showed high pathogenicity against the fry (15 dph) and fingering (40 dph) of snakehead fish but did not in the larger size (90 dph).

• Proceedings of the Korean Society of Veterinary Pathology Conference
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• 2001.09a
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• pp.32-32
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• 2001

2000년 4월 1일 경, 경북 구룡포소재 넙치양식장에서 임상적으로 채색흑화 및 복수의 저류를 동반하며 1 주일만에 총 10 만미 중 약 2%(2,000미)가 급성 폐사하는 질병이 발생하였다. 발병 당시의 수온은 13~14$^{\circ}C$, 염분농도는 32~33$ extperthousand$로 측정되었다. 세균검사 및 외부기생충 검사에서는 음성이었다. 본 질병은 저수온기 넙치에서 발병하는데, 작년 4월에 발증예가 실험실로 의뢰된 적이 있으며 올해에는 2월 말경부터 경북 포항 및 남해 상주에서도 발증ㆍ폐사되기 시작하여 넙치 양식장에 큰 피해를 입히고 있다. 따라서 이들 질병예에 대한 병리조직학적 검사를 실시하였기에 그 결과를 보고하고 가능 원인체에 대하여 고찰하고자 하였다. (중략)

• Korean Journal of Ichthyology
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• v.27 no.4
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• pp.306-309
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• 2015

In 2014, high mortality was observed in olive flounder (Paralichthys olivaceus) during experimental infection. Diseased fish did not show any outward clinical signs, but numerous fungal hyphae were detected in the gills. No parasites or bacteria were isolated from the diseased fish. A high mortality rate (100%) resulted when cohabitation with fungi-infected fish were applied to healthy fish. The affected fish exhibited sever fungi infection in the gills. Histopathological examination revealed numerous fungal hyphae and mycelium around gill filament, lamellar and racker. These results suggest that the fungi may be related with the mortality of olive flounder.