• 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.

• 한국환경생태학회:학술대회논문집
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• 한국환경생태학회 2011년 학술대회 논문집 2호
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• pp.71-74
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• 2010

• Parasites, Hosts and Diseases
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• 제58권6호
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• pp.695-699
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• 2020

Present study was performed to know the infection status of Gnathostoma sp. larvae in swamp eels from Cambodia. We purchased total 30 Asian swamp eels, Monopterus albus, from local markets in Pursat and Takeo Provinces and Phnom Penh on May and November 2017 and May 2018. All collected eels were transferred to our laboratory with ice and each of them was examined by artificial digestion method. A total of 15 larval gnathostomes (1-5 larvae) were detected from 55.6% (5/9) swamp eels in Pursat Province. No larval gnathostomes were found in 21 swamp eels in Takeo Province and Phnom Penh. The advanced third-stage larvae (AdL3) detected were 2.575-3.825 (3.250) mm in length and 0.375-0.425 (0.386) mm in width. They had the characteristic head bulb (av. 0.104×0.218 mm) with 4 rows of hooklets, long muscular esophagus (1.048 mm), and 2 pairs of cervical sacs (0.615 mm). The number of hooklets in 4 rows on the head bulb was 41, 44, 47, and 50. In scanning electron microscopy, characteristic features were 4 rows of hooklets on the head bulb, cervical papillae, tegumental spines regularly arranged in transverse striations, and anus. The larval gnathostomes were identified as AdL3 of Gnathostoma spinigerum based on the morphological characters. By the present study, it has been confirmed that G. spinigerum larvae are infected in Asian swamp eels, M. albus, in Pursat Province, Cambodia.

• Parasites, Hosts and Diseases
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• 제53권5호
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• pp.619-625
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• 2015

The present study was performed to determine the infection status of swamp eels with Gnathostoma sp. larvae in Myanmar. We purchased total 37 Asian swamp eels, Monopterus albus, from a local market in Yangon in June and December 2013 and 2014. All collected eels were transferred with ice to our laboratory and each of them was examined by the artificial digestion technique. A total of 401 larval gnathostomes (1-96 larvae/eel) were detected in 33 (89.2%) swamp eels. Most of the larvae (n=383; 95.5%) were found in the muscle. The remaining 18 larvae were detected in the viscera. The advanced third-stage larvae ($AdL_3$) were 2.3-4.4 mm long and 0.25-0.425 mm wide. The characteristic head bulb ($0.093{\times}0.221mm$ in average size) with 4 rows of hooklets, muscular long esophagus (1.025 mm), and 2 pairs of cervical sacs (0.574 mm) were observed by light microscopy. The average number of hooklets in the 1st, 2nd, 3rd, and 4th rows was 41, 45, 48, and 51, respectively. As scanning electron microscopic findings, the characteristic 4-5 rows of hooklets on the head bulb, a cervical papilla, tegumental spines regularly arranged in the transverse striations, and an anus were well observed. Based on these morphological characters, they were identified as the AdL3 of Gnathostoma spinigerum. By the present study, it has been confirmed for the first time that Asian swamp eels, M. albus, from Yangon, Myanmar are heavily infected with G. spinigerum larvae.

• Parasites, Hosts and Diseases
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• 제50권2호
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• pp.113-118
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• 2012

From July 2008 to June 2009, livers of the swamp eels (Monopterus alba) were investigated for advanced third-stage larvae (AL3) of Gnathostoma spinigerum. Results revealed that 10.2% (106/1,037) and 20.4% (78/383) of farmed eels from Aranyaprathet District, Sa Kaeo Province and those of wild-caught eels obtained from a market in Min Buri District of Bangkok, Thailand were infected, respectively. The prevalence was high during the rainy and winter seasons. The infection rate abruptly decreased in the beginning of summer. The highest infection rate (13.7%) was observed in September and absence of infection (0%) in March-April in the farmed eels. Whereas, in the wild-caught eels, the highest rate (30.7%) was observed in November, and the rate decreased to the lowest at 6.3% in March. The average no. (mean${\pm}$SE) of AL3 per investigated liver in farmed eels ($1.1{\pm}0.2$) was significantly lower (P=0.040) than those in the caught eels ($0.2{\pm}0.03$). In addition, the intensity of AL3 recovered from each infected liver varied from 1 to 18 ($2.3{\pm}0.3$) in the farmed eels and from 1 to 47 ($6.3{\pm}1.2$) in the caught eels, respectively. The AL3 intensity showed significant difference (P=0.011) between these 2 different sources of eels. This is the first observation that farmed eels showed positive findings of G. spinigerum infective larvae. This may affect the standard farming of the culture farm and also present a risk of consuming undercooked eels from the wild-caught and farmed eels.

• 한국동물학회지
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• 제33권1호
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• pp.103-107
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• 1990

BSA로 면역시킨 드렁허리의 혈청에서 lgM 유사면역글로불린의 정제한 후 그 구조적 특성을 구명하였다. 면역후 항혈청에서는 항원특이 항체능이 증가되었다. 정제된 lgM 유사면역글로불린은 199kD의 분자량을 갖는 단량체 4개가 결합된 800kD의 단백질이었으며, 단량체는 70kD인 H-사슬 2개와 29.5kD인 L-사슬 2개가 결합된 형태였다. 또한 드렁허리의 lgM 유사면역글로불린은 lgM의 특성과 같이 포유류 적혈구에 대하여 약한 응집력을 나타냈다.

• 한국어류학회지
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• 제36권1호
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• pp.40-47
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• 2024

본 연구에서는 드렁허리 Monopterus albus 후각기관의 형태 및 조직학적 특성을 실체, 광학 및 주사전자현미경하 관찰을 통하여 조사하였다. 후각기관의 외부 형태는 피부와 평행한 폐쇄형 전비공과 후비공을 나타냈다. 내부 구조는 파이프형 비강과 뒤쪽의 위아래의 두 개 비낭으로 구성되었다. 비강의 내벽은 위중층상피층의 감각상피와 중층편평상피층의 비감각상피, 미확인기관으로 이루어졌다. 감각상피는 후감각뉴런, 지지세포, 기저세포, 림프구로 구성되며, 비감각상피는 중층상피세포와 산성의 점액다당류를 보유하는 점액세포를 보유했다. 특히, 감각상피층 내 모세혈관과 풍부한 진피에서의 혈관화는 논, 농수로, 연못, 늪과 같은 진흙 하상의 정체된 수환경에 적응 된 후각기관 내 부가적인 호흡기능의 증거이며 이는 이전에 원구류 이상의 어류 분류군에서 확인되지 않은 새로운 결과로 확인된다.