Journal of fish pathology (한국어병학회지)

The Korean Society of Fish Pathology (한국어병학회)
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Trematodes larva in 3 species of bivalves )Corbicula japonica, Sinonovaculla constrica and Ruditaps philippnarum)

간석지산 이매패에서의 흡충류 유충에 관한 연구

  • Published : 20031200
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Abstract

The present study was conducted to research some parastic trematodes species in marine bivalves which are widely distributed in the western sea in Korea. From April, 2001 to October, 2002, marsh calm (Corbicula japonica) were obtained from Kochang bay near the Sunun temple and razor calm (Sinonovaculla constricta) from Kaehwado. Short necked calm (Ruditapes philippnarum) were sampled from Ochungdo, Mardo and Kaeyado. Cercaria corbiculae was found in the gonad of C. japonica with a low infection rate of 0.83%. The cercaria and the sporocyst were sized $278{\times}98{\mu}$ and $890{\times}275{\mu}$, respectively. Some encysted larvae of Parvatrema duboisi sized $0.351{\times}0.182mm$ were firstly found in the mantle of S. constricta in Korea. Each S. constricta contained 1-9 cysts and the infection rate was 48.3%. Cercaria tapidis was found in the both gonad and mantle of R. philippinarum. The annual average infection rate in the R. philippinarum from Ochungdo was 7.7%. This rate was much higher than those from Solri near the Kum river estuary in 1981. The infection rate of C. tapidis in R. philippinarum was different in sizes. The maximum rate was 4.8% in size 3.6-4.0cm and the minimum rate 0.8% in size 4-5cm.

해산 이매패류에서의 흡충류의 기생종과 병해를 조사 할 목적으로 2001년 4월부터 2002년 10월 사이에 우리나라 서해안 내륙지와 인접한 전북 고창의 부창만내 주진천의 일본재첩과 부안군 계화도의 가리맛조개, 그리고 육지로부터 멀리 떨어져 있는 어청도와 말도 및 개야도에서 채집한 바지락을 조사하였다. 일본재첩에서는 조개내의 생식소에서 한국산 미 기록종인 Cercaria corbiculae가 검출되었는데, 그 크기는 $278{\times}98{\mu}$, sporocyst는 $890{\times}275${\mu}$이었고, 0.83%의 낮은 기생율을 나타냈다. 계화도산 가리맛조개의 외투막에서 크기가 0.351×0.182mm의 Parvatrema duboisi의 피낭 유충을 검출 하였다. 가리맛조개는 이 종의 새로운 중간 숙주가 되며, 조개에서의 기생율은 48.3%이었고, 조개 1개당 1-9마리가 기생되었으며, 수온과 조개의 크기에 따른 기생율에서는 큰 차이가 없었다. 어청도와 말도 및 개야도산 바지락에서 꼬리 긴 cercaria의 일종인 Cercaria tapidis가 조개의 생식소와 외투막에서 검출되었으며, 어청도산 바지락의 연평균 기생율은 7.7%, 기생율이 가장 높은 달은 수온 $11^{\circ}C$인 12월에 16.7%, 가장 낮은 달은 수온 $19^{\circ}C$인 7월에 4.8%로 육지와 접한 금강하구의 솔리산 바지락에서의 연평균 기생율(5.75%)이나 월별 기생율이 오히려 내륙과 연결된 간석지산 바지락 보다 약간 높았다. 바지락의 크기별 기생율은 각장 3.6-4.0cm가 48.3%로 가장 높은 기생율을 나타낸 반면, 각장 4-5cm의 큰 조개에서는 0.8%의 낮은 기생율을 나타냈다.

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References

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