• 제목/요약/키워드: snails

검색결과 175건 처리시간 0.024초

이전고환극구흡충(Echinostoma cinitorchis)의 cercaria 유출 및 수종 어류에의 cercaria 감염 실험 (Cercarial shedding of Echinostoma cinetoychis and experimental infection of the cercariae to several kinds of snails)

  • 안영겸;양용석
    • Parasites, Hosts and Diseases
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    • 제27권3호
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    • pp.203-212
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    • 1989
  • 실험실에서 사육한 수종 패류를 이용하여 Echinostoma cinetorchis의 생활환을 형성시키 며 발육과정을 관찰하였다. 성충체(흰쥐에서 얻음)에서 분리한 충란을 배양하여 miracidium을 얻고 제 1중간숙주인 Hippeutis sp. 우렁이에 20개씩 감염시킨 바 58.3%(12개 중 7)는 cercaria 유출 전에 감염사하였고 나머지는 25일 째부터 7∼9일간 cercaria를 유출하였다. 이 cercaria를 수종의 패류에 접촉감염(패당 40∼50마리)시켰더니 피낭유충 형성은 Hippeutis sp.에서 100%(접촉 cercaria에 대한 피낭 비율은 56.7%), Radix auricuzaria coreana 100% (66.4%), Phyla acute 66.7% (37.3%) 및 자연산 Cipangopaludina sp. 50% (8%) 감염으로 전 실험 패류가 피낭유충을 형성하였다. Cercaria는 침입시 노출부인 두부, 족부에 부착한 후 포복하여 외투강 내로 이행하며, 패 체내의 피낭부위는 외투막, 원체강내, 내부 기관 및 조직 사이였다. 그리고 이를 흰쥐에 감염시켜 성충을 검출할 수 있었다. 이상의 결과로 한국에 있어서 E. cinetorchis의 주요 인체 감염원 역할을 할 것으로 믿어지는 논우렁이(Cipnngopaludina sp.)에 있어서 피낭유충 형성을 확인할 수 있었고 이 극구흡충은 타종(특히 E. hortense)과 달리 여러 담수 패류가 제2중간숙주 역할을 하고 있음을 확인하였다.

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간질(肝蛭)의 중간숙주인 Lymnaea viridis의 실험실 사육 및 생태에 관한 연구 (The life - history of Lymnaea viridis, the intermediate host of Fasciola hepatica, under laboratory conditions)

  • 이정길;김상기;이채용
    • 대한수의학회지
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    • 제33권2호
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    • pp.277-283
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    • 1993
  • In the present study, observations were made on the life-history of Lymnaea viridis under laboratory conditions, involving incubation period of the eggs and their hatching rate, shell length of the newly hatched snails, sexual maturity, size of the snails when the snail produced the first egg-mass, the number of eggs in each egg-mass, egg-laying, ovipostion, growth rate of the snails, and longevity of the snail. At temperatures between $19.8^{\circ}C$ to $22.5^{\circ}C$, incubation period of the eggs occupied 10~12 days, and after beginning of hatching, all young snails emerged completely from the egg-mass within 5 days. The hatching rate was 88%. The average shell length of the newly hatched snails was about 0.064cm. The rate of growth was extraordinarily rapid under good laboratory conditions. When two snails were reared in one culture vessel($20{\times}15{\times}5cm$) with blue-green algae at about $22^{\circ}C$, snail growth was optimal, taking 37 days to reach 1.2cm in shell length. Sexual maturity reached in about 19 days. The size of the snails at sexual maturity was $0.78{\pm}0.05cm$ in length and $0.47{\pm}0.04cm$ in width. The first egg-masses produced were $0.59{\pm}0.22cm$ in length and $0.34{\pm}0.08cm$ in width, and contained 7~38 eggs. The eggs are usually laid in water. The egg-laying was affected by food and temperature. Snails fed with blue-green algae at about $22^{\circ}C$ produced larger egg-masses than the snails fed with fish food at about $26^{\circ}C$. Under conditions of continuous activity and growth, the maximum expectation of life appears to be 109~350(mean 230) days. And the shell length of snails at death were 1.39~1.64cm.

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Utilization of snails as food and therapeutic agents by Baiga tribals of Baihar tehsil of Balaghat District, Madhya Pradesh, India

  • Baghele, Mahendra;Mishra, Shubhi;Meyer-Rochow, Victor Benno;Jung, Chuleui;Ghosh, Sampat
    • International Journal of Industrial Entomology and Biomaterials
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    • 제43권2호
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    • pp.78-84
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    • 2021
  • We explored the indigenous local knowledge associated with the use of snails by Baiga people in Baihar tehsil of Balaghat district in central India through interview with a semi-structured questionnaire. Results revealed that Baiga people widely accept snails of 3-5 morpho-groups belonging to Ampullariidae, and Viviparidae family as food. Besides, use of snail as therapeutic agents for ailments like body ache, joint pain, digestion, weakness of bones etc. were found common. Hand-picking of snails from the wild environments as well as agriculture field was the primary way of harvesting edible snails. We advocate the development of a farming system for the continuous supply of snails as a food resource, advancement of scientific investigation of functional properties of them, economic progress of the region and therefore the overall sustainability.

Fasciola hepatica in Snails Collected from Water-Dropwort Fields using PCR

  • Kim, Hwang-Yong;Choi, In-Wook;Kim, Yeon-Rok;Quan, Juan-Hua;Ismail, Hassan Ahmed Hassan Ahmed;Cha, Guang-Ho;Hong, Sung-Jong;Lee, Young-Ha
    • Parasites, Hosts and Diseases
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    • 제52권6호
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    • pp.645-652
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    • 2014
  • Fasciola hepatica is a trematode that causes zoonosis mainly in cattle and sheep and occasionally in humans. Fascioliasis has been reported in Korea; however, determining F. hepatica infection in snails has not been done recently. Thus, using PCR, we evaluated the prevalence of F. hepatica infection in snails at 4 large water-dropwort fields. Among 349 examined snails, F. hepatica-specific internal transcribed space 1 (ITS-1) and/or ITS-2 markers were detected in 12 snails and confirmed using sequence analysis. Morphologically, 213 of 349 collected snails were dextral shelled, which is the same aperture as the lymnaeid snail, the vectorial host for F. hepatica. Among the 12 F. hepatica-infected snails, 6 were known first intermediate hosts in Korea (Lymnaea viridis and L. ollula) and the remaining 6 (Lymnaea sp.) were potentially a new first intermediate host in Korea. It has been shown that the overall prevalence of the snails contaminated with F. hepatica in water-dropwort fields was 3.4%; however, the prevalence varied among the fields. This is the first study to estimate the prevalence of F. hepatica infection using the vectorial capacity of the snails in Korea.

Effectiveness of Plant-Based Attractants in Preventing the Escape of Golden Apple Snails (Pomacea canaliculata) into the Ecosystem

  • Il Kyu Cho;So-Young Jang;Woo Young Cho;Yun-Su Jeong;Jun Seok Kim;Seong Eun Han;Kil Yong Kim;Gi-Woo Hyoung
    • 한국환경농학회지
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    • 제42권4호
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    • pp.371-381
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    • 2023
  • The effectiveness of plant-based attractants was studied using large traps, which attracted relatively more snails in agricultural water drainage ditches and rice-cultivating environments, although their effectiveness in rice fields and lakes was limited. The rate began to rise after three hours of observation. Watermelon peel exhibited the highest apple snail attraction rate (13.8%), followed by potatoes (10.0%), and apple peel (8.8%). These values significantly differed from the attraction rate attributed to papaya leaves (F=3.84; P=0.0387). After 24 h, watermelon peel and apple peel indicated a higher rate of attraction (23.4% and 21.7%, respectively), which were significantly different compared with those of papaya leaves and potatoes (F=9.94; P=0.00455). Large bait traps outperformed funnel traps in capturing golden apple snails and trapped a significant number of snails measuring over 1 cm in size. Watermelon peel was the most effective attractant for a large bait trap, followed by apple peel, potatoes, and papaya leaves. On average, 110 snails were captured in the lure net. However, potatoes, apple peels, and papaya leaves caught an average of 93, 80, and 79 snails, respectively. Among the attractants, the lure effect of the snails was not significantly different. The efficiency of large bait traps in capturing snails, regardless of the plant attractant employed, followed the order: apple peel > watermelon peel and potatoes > papaya leaves > melon > Korean melon. Watermelon peel is highly recommended for farmer use, as well as apple peel and potatoes. Utilizing these snail attractants may contribute positively to developing a safe and environment-friendly integrated pest management strategy.

친환경농법용 외래 왕우렁이의 생태위해성 및 위해성 관리의 필요성 (Ecological Risk of Alien Apple Snails Used in Environmentally-friendly Agriculture and the Urgent Need for Its Risk Management in Korea)

  • 방상원;조미경
    • 환경생물
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    • 제26권3호
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    • pp.129-137
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    • 2008
  • 국내에서 친환경농법으로 사용되고 있는 왕우렁이는 본래 외국으로부터 들여온 외래종으로 국내의 토종 우렁이와는 다른 종이다. 왕우렁이농법은 논에서 지속적이고 높은 제초효과와 그에 따른 제초제 사용의 감소 및 비용의 절감으로 인하여 국내에서 많이 사용되는 친환경농법의 하나이다. 특히 최근 2008년도 3월에서 5월까지 조류독감의 전국적인 발생으로 인하여 중앙정부와 지방자치단체는 오리농법의 사용을 자제하는 대신에 이를 대체할 농법으로 왕우렁이농법을 권장함으로써 왕우렁이의 사용은 더욱 증가할 것으로 예상되고 있다. 외래왕우렁이는 토종 우렁이와는 달리 알을 낳아 산란하기 때문에 대량증식이 용이하고 우화율도 95.8%로 높아 잠재적 해충으로써의 가능성이 높다. 이와 더불어 일본과 대만 그리고 동남아시아의 국가들에서는 이미 외래 왕우렁이로 인한 생태계 및 농업의 피해가 보고된 바 있고, 국제자연보전연맹은 왕우렁이를 "세계 100대 최악의 침입외래종"으로 지정하고 있다. 국내에서도 친환경농법으로 외래 왕우렁이를 수입 사용하면서 상대적으로 따뜻한 겨울기온을 보이는 전남, 전북, 경남, 경북, 충남, 강원의 일부지역에서 왕우렁이가 자연생태계로 유출되어 월동하거나 서식하는 것이 발견되고 있어 타 국가에서와 같이 외래 왕우렁이에 의한 생태계 피해가 우려되고 있는 실정이다. 그러나 최근 농림기관과 왕우렁이 농업 관련 단체들은 왕우렁이농법의 친환경적 이점과 최근 일부지역에 대해 실시된 월동조사에서 월동이 불가능하였던 연구결과를 내세워 왕우렁이에 대한 생태계 교란야생동 식물종으로의 지정을 반대하고 있다. 따라서 본고는 국내 외에서 외래 왕우렁이에 의한 생태 및 농업적 위해성을 분석하고, 국내의 여건 변화에 따른 왕우렁이의 생태위해성을 제시하여, 왕우렁이에 대한 위해성 판단이 명확해 질 때까지 왕우렁이의 합리적인 사용과 함께 국가차윈의 과학적인 생태위해성 관리의 필요성과 당위성을 제시하였다.

한국산 다슬기(Semisulcospira spp.)의 흡충류 유미유충 감염실태 및 농약의 잔류성에 관한 조사연구 (Residual Chlorinated Hydrocarbon Pesticides in Semisulcospira spp. (Gastropoda: Pleuroceridae) Collected at the Endemic and Non-endemic Areas of Paragonimiasis in Korea)

  • 임승균;정인실;정평림;이근태
    • 한국패류학회지
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    • 제2권1호
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    • pp.13-25
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    • 1986
  • One of the most medically important snail species of Korea is Semisulcospira spp., a member of the freshwater prosobranch family pleuroceridae. The parasites that these snails transmit to humans are mainly Paragonimus westermani and Metagonimus yokogawoi. On the other hand, Semisulcospira snails are edible as a foodstuff in Korea. The present study was first aimed to detect out residual pesticides in the snails collected at the endemic and non-endemic areas of paragonimiasis in Korea and to make relationship to the detectability of larval trematodes shed from the snails. In addition, water specimens from the habitats where the snails were collected were sampled and analysed to elucidate environmental conditions of the habitats. This malaco-ecological survey was done at 7 endemic and 3 non-endemic areas of paragonimiasis for about more than 2 years, May, 1984 through October, 1986. All the water smaples both from the endemic and non-endemic areas of paragonimiasis showed normal ranges of the criteria of upper freshwater streams, with lower B.O.D. (0.4~2.0 ppm) and higher D.O. values (9.5~11.0 ppm) than those in the large river systems Infection rate of digenetic trematodes in total snails collected was 6.7%, but no Paragonimus cercaria was detected out at all even in the endemic areas of paragonimiasis. The ecological factors affecting Paragonimus larvae in the snails were also discussed. A total of 9 chlorinated hydrocarbon pesticieds was targeted to detect out from the tissues of snails. Out of 9 pesticides, aldrin, beta-BHC, p, p-DDT, dieldrin, DDE, lindane, heptachlor and heptachlor epoxide were eluted from the snails. The highest levels of the pesticides were mostly detected out in the snails collected from the Donghae-Chun area of Haman and the Kangwha area of Kyongki-Do, where the lowest infection rates of trematode cercariae (0~0.5%) were revealed. The possibilities that the residual pesticides in the freshwater animals including Semisulcospira snails might be transferable to humans were also discussed.

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강원도 육산패류의 분포 (Distribution of the Land Snails in Kangweon-Do , Korea)

  • 이준상;권오길
    • 한국패류학회지
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    • 제13권2호
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    • pp.117-123
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    • 1997
  • S study on the distribution of land snails in Kangweon-Do was carried out from May 1990 to July 1995. Mirus sp, and Aegista gottschei kongoensis were unrecorded in Korea and south Korea, respectively, As a result of this stududy, 21 families and 62 species of land snails are reported from Kangweon-Do, Korea.

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Synthesis of New Uracil-5-Sulfonamide Derivatives and Immuno-Stimulatory Effect of a Chemically Modified Hemolymph of Biomphalaria alexandrina on Schistosoma mansoni Infected Mice

  • Fathalla, O.A.;Haiba, M.E.;Maghraby, A.S.
    • Archives of Pharmacal Research
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    • 제26권5호
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    • pp.358-366
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    • 2003
  • Some N-p-substituted phenyl uracil-5-sulphonamide derivatives have been synthesized to be evaluated as molluscicides against Biomphalaria alexandrina snails, the intermediate host of Schistosoma mansoni. Schistosoma mansoni infected mice were treated with hemolymph obtained from pre-treated Biomphalaria alexandrina snails with the products 4a, 10a, 10b and 4b or obtained from non-treated snails. The selection of the concentration based on the predetermined dose which caused mortality of less than 50% of snails/24 h. $LC_{50}$ of compounds 4a, 10a, 10b and 4b was 50, 100, 200 and 50 ppm respectively. The result showed that immuno-stimulatory effect of treated hemolymph with compounds 4a, 10a and 4b was related to significant protective effects (44.4, 34.6 and 50.4% reduction in worm burden respectively). In addition, mean total worm burdens were significantly reduced in non treated hemolymph by 33.8%. The effect of hemolymph obtained from treated or non treated snails on S. mansoni adult worms antigens was studied by indirect immunofluorescence technique using chronic mouse sera (CMS). The results indicated that there was a strong reaction with epitopes in gut epithelium, tubercles, teigument and subtegumental musculature of untreated and treated S. mansoni adult worms antigens. Therefore, treatment of hemolymph obtained from pre-treated snails with compounds 4a, 10a, and 4b can stimulate specific immune response and induce protective effects against S. mansoni infection.

Population Dynamics of Intermediate-Host Snails in the White Nile River, Sudan: A Year-Round Observational Descriptive Study

  • Ismail, Hassan A.H.A.;Ahmed, Abed el Aziz A. el R.M.;Lee, Young-Ha;Elhag, Mousab Siddig;Kim, Youngjin;Cha, Seungman;Jin, Yan
    • Parasites, Hosts and Diseases
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    • 제59권2호
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    • pp.121-129
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    • 2021
  • We aimed to explore the population dynamics of snail in 3 sites of the White Nile in Sudan. More specifically, we aimed to investigate the annual patterns of snail populations that act as intermediate hosts of schistosomes and monthly snail infection rates and ecological characteristics presumably related to snail populations. We collected snails for 1 year monthly at 3 different shore sites in the vicinity of El Shajara along the White Nile river in Khartoum State, Sudan. In addition, we measured air and water temperatures, water turbidities, vegetation coverages, and water depths and current speeds. Most of the collected snails were Biomphalaria pfeifferi and Bulinus truncatus. The population densities of snails and their infection rates varied across survey sites. The collected snails liberated S. mansoni and S. haematobium cercariae as well as Amphistome and Echinostome cercariae. Infected snails were found during March-June. The ecological characteristics found to be associated with the absence of snails population were: high turbidity, deep water, low vegetation coverage (near absence of vegetation), high water temperature, and high current speed. To our knowledge, this is the first longitudinal study of the snail population and ecological characteristics in the main basin of the White Nile river.