• 한국어병학회지
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• 제21권3호
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• pp.259-270
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• 2008

Disease surveillance was performed to monitor the prevalence of fish pathogens in wild marine fish caught in coastal offshore water in Korea. A total of 333 of fish samples were collected at set net or fish market at landing port in Pohang (East Sea), Taean (Western Sea), Goseong and Tongyeong (Southern Sea) and 21 species of pathogens causing clinical infections to farmed fish were investigated. The detection rates of fish pathogens from Mugili formes, Tetraodontiformes, Pleuroneciformes, Sorpaeniformes, erciformes and Clupeiformes were 90.9, 61.1, 47.6, 43.6, 37.2 and 11.8%, respectively. Comparing with prevalence of diseases seasonally, both the detection rates of bacteria and parasite were higher than those of virus in April but the detection rates of parasites were distinctively higher than those of bacteria in August with high water temperature. Virus were detected in fish samples caught in the Western and Southern Sea in April. The detected parasites were Trichodina, Ichthyophthirius, Dactylogyrus, Microcotyle, Bivagina, Caligus, Alella and Myxobolus. Among the bacterial pathogens, Vibrio, Streptococcus, Photobacterium, Psuedomonas were predominant. Viral nervous necrosis virus (VNNV) and flounder lymphocystis disease virus (FLDV) were detected from the 6 species of fish virus examined in this study.

• 한국어병학회지
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• 제26권3호
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• pp.129-137
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• 2013

Kudoa septempunctata가 한국의 양식 넙치의 근육에 기생하는 것이 보고되어, 본 연구에서는 2012년 동안 제주 지역의 양식 넙치 및 자연산 어류에서 K. septempunctata의 감염 현황을 조사하였다. 제주지역 26개소의 넙치 양식장으로부터 143마리를 조사한 결과, 4개소 7마리(4.9%)에서 쿠도아 감염이 확인되었으며, 넙치 치어 67마리에서는 쿠도아가 검출되지 않았다. 또한, 제주 지역에서 어획 된 자연산 어류 8종에서도 쿠도아가 검출되지 않았다. 쿠도아가 검출 된 7마리 어류에 대하여 등근육 부위별 쿠도아 검출을 비교하기 위하여, 넙치의 두부쪽에서 채취한 등근육, 미부쪽에서 채취한 등근육, 그리고 등근육전체를 긁어 모은 샘플을 사용하여 검출률을 비교한 결과, 전체를 긁어 모든 샘플을 사용할 경우 검출률이 100%로 가장 높아, 어느 한 쪽에서 근육을 채취하는 것 보다 등근육 전체 부위를 골고루 채취하는 것이 쿠도아 검출에 더 효율적임을 확인하였다.

• Parasites, Hosts and Diseases
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• 제58권6호
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• pp.647-652
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• 2020

Clonorchis sinensis is the most common fish-borne intestinal parasite in Korea. The aim of the present investigation was to survey the status of C. sinensis infection and analyze associated risk factors in residents of Haman-gun, Gyeongsangnam-do. A total of 5,114 residents from 10 administrative towns/villages voluntarily agreed to participate in the study, which comprised fecal examination, a questionnaire survey for risk factors, ultrasonography, and enzyme-linked immunosorbent assay for cancer biomarker detection in the blood. We detected C. sinensis eggs in 5.3% of the subjects. By region, Gunbuk-myeon had the highest number of residents with C. sinensis eggs. The infection rate and intensity were higher in male than in female residents. Based on the risk factor questionnaire, infection was highly associated with drinking, a history of C. sinensis infection, and the practice of eating of raw freshwater fish. Extension of the bile duct, infection intensity, and cancer biomarker detection significantly correlated with the presence of eggs in the study population. In conclusion, the development of feasible, long-term control policies and strategies for the elimination of C. sinensis in Korea is still required.

• 한국어병학회지
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• 제9권2호
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• pp.119-126
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• 1996

1995년 4월부터 10월까지 전남 가막만과 경남 남해 해역에서 양식하는 조피볼락에 기생하는 아가미흡충 Microcotyle sebastisci의 기생률 변동 및 병리조직학적 변화를 조사하였다. M. sebastisci는 6~7월에 나타나지 않았고, 주로 새엽 II~III에 기생하였다. 기생된 부위는 미세한 출혈과 함께 점액이 다량 분비되었다. 남해의 경우 9월에 있어서 감염률, 상대 감염밀도, 평균 감염강도는 각각 40.0%, 30.7, 76.8을 나타내었다. 또한 가막만의 경우는 10월에 감염률, 상대 감염밀도, 평균 감염강도는 각각 46.0%, 40.5, 88.0으로 조사기간 중 가장 높게 나타났다. 병리조직학적 소견으로는 호흡상피세포의 증생, 비후, 새박판간상피세포의 중생과 새변의 곤봉화가 일어났다. 2차적으로 세균의 감염에 의한 아가미 부식도 관찰되었다.

• 한국어병학회지
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• 제26권3호
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• pp.303-310
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• 2013

2013년 3월부터 국립수산과학원 내수면양식연구센터에서는 종 보존 연구를 위해 1,000미의 드렁허리(Monopterus albus)를 양성하고 있었다. 그러던 중에 100미의 드렁허리에서 체색흑화, 점액과다, 항문돌출과 같은 임상증상을 보였으며 몇몇 개체들은 폐사하였다. 해부 검사한 결과 100미 전부 구두충에 감염된 것을 확인할 수 있었다. 이에 드렁허리에 감염된 구두충을 병리조직학적으로 관찰하였다. 구두충은 소화관 전반에서 관찰되었으며 개체 당 평균 19미의 충체를 확인할 수 있었다. 중감염된 개체에서는 구두충에 의한 장폐색 증상을 보였으며 충체는 소화관 점막하층에 proboscis를 침투시켜 기생하고 있었다. 특징적으로 위와 장에서 점막상피내 충혈과 점막하조직내 호산성 세포의 침윤, 염증반응, 기생충성 육아종 소견을 보였다. 일부 개체에서는 위선상피의 공포화와 장 점막층의 괴사도 관찰되었다. 소화관 외 기타장기에서는 특징적인 병변은 관찰되지 않았다. 본 연구로 드렁허리에 감염된 구두충의 감염정도를 알 수 있었고, 향후 드렁허리 양식에 큰 도움이 될 것으로 보인다.

• 한국식품위생안전성학회지
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• 제7권2호
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• pp.107.2-119
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• 1992

Fish pathology is one of the main scientific bases upon which this expansion in aquaculture has been dependent and requires a wide knowledge of the environmental constraints, the physiology and characteristic of the various pathogens, the responses of the host, and the methods by which they may be controlled. The primary disease and parasite problems in aquaculture animals related to viral, bacteria, fungal and protozoan epizootics. Parasitic nematodes, trematodes and cestodes are commonly found in aquaculture animals, but seldom are they present in concentrations sufficient to cause significant problems, When an epizootic does occur and chemical treatment is indicated, the appropriate chemical must be selected an properly applied. We have antibiotics, sulfa, nitrofuran and other chemicals for treatment of fish diseases, Some may be mixed with the feed during formulation, added to the pellets of feed as a surface coating, given in the form of an injection or used as a bath. Even though a drug or chemical has been officially approved for use in aquaculture, the substance should never be used unless there is a clear need, Some of the reasions for this view are as follows: (1) the constant use of antibiotics can leak to the development of resistant strains of bacteria, (2) biofilter efficiency may be impaired or destroyed by chemicals added to closed recirculating water systems, and(3) the injudicious use of chemical can have a damaging effect on the environment as well as on human.

• Journal of Species Research
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• 제6권spc호
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• pp.8-14
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• 2017

Taeniacanthid copepods Anchistrotos kojimensis Do and Ho, 1983 were collected from the branchial cavities of stichaeid fish, Ernogrammus hexagrammus (Schlegel) and yellowfin goby, Acanthogobius flavimanus (Temminck and Schlegel) in Korean waters. Here, we provide the first description of a male of Anchistrotos Do and Ho, 1983. A close comparison of the specimens of A. kojimensis collected from Korea with the original description revealed differences in the adult female: (1) the caudal ramus bears seven setae (seta I minute); (2) the maxillule with small knob-like process anteriorly; (3) leg 5 ornamented with patched spinules distally and having row of spinules at base of each spine and distal seta. The first description of the adult male reveals the following features: (1) the distal abdominal somite had rows of spinules anteriorly and near insertion of each caudal ramus; (2) the postantennal process is more elongate than in the female; (3) the basis of maxilliped is with two prosimomedial setae, two longitudinal rows of stout denticles found on posteromedial surface and row of spinules on anteromedial surface; and (4) the second endopodal segment is a strongly curved claw, with a row of stout denticles along a concave margin, two long and one small setae.

• 한국어병학회지
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• 제7권2호
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• pp.83-94
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• 1994

한국 양식산 우렁쉥이의 외투강에서 채집된 기생성 요각류 1 종이 Bonnierilla 속의 신종임이 확인되어 B. namhaesius 으로 명명하였다. 본 종은 제 1 안테나 8 개 마디의 강모식 3, 17+1 hook, 9+1 aesthete 5, 3, 2, 2+1 aesthete, 7+1 aesthete 를 갖는 점과 제 2 외지에서 제 4 외지 마지막 마디의 II, 5 및 caudal ramu 의 끝 부분에 2, 3, I의 형태를 갖으므로서 다른 종과 구별된다. 또한 Bonnierilla 속 중에서 수컷은 두번째로, 유생은 처음으로 기재한다.

• 한국어병학회지
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• 제26권1호
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• pp.31-38
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• 2013

The edible ascidian, Halocynthia roretzi is a commercially important fisheries resource in Korea. However, there have been outbreaks of mass mortality due to soft tunic syndrome. It was discovered recently that the cause of death is infection by a protozoan parasite Azumiobodo hoyamushi. Alamar blue assay and microscopic counting were used to estimate anti-protozoal effects of 20 drugs having different action mechanisms. Through comparison of alamar blue assay and microscopic counting, 6 drugs were found to be potential in protozoan-killing effects: amphotericin B, formalin, hydrogen peroxide, bithionol, benzalkonium chloride, bronopol (24hr-$EC_{50}{\leq}20{\mu}g/ml$). The preliminary data can be used as a basis to develop anti-protozoal agents against A. hoyamushi.

• Parasites, Hosts and Diseases
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• 제44권1호
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• pp.81-86
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• 2006

Anisakiasis is a parasitic disease caused by ingestion of raw fish infected with anisakid larvae. Endoscopic changing patterns of submucosal lesions in chronic gastric anisakiasis have not been known yet. Here we report 4 cases of suspected gastric anisakiasis which were improved during follow-up periods without surgical treatment. The patients presented with abdominal pain, nausea and vomiting after consuming raw marine fish, and visited our gastroenterology outpatient department. Their endoscopic findings showed firm and yellowish submucosal masses accompanied with eccentric erosions. Histologic findings showed severe eosinophilic infiltrations. In blood tests, peripheral eosinophil counts and total IgE levels were elevated. We believed that all cases were caused by larval anisakid infections. The submucosal mass lesions disappeared during the follow-up periods of 2 to 4 mo.