The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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Report on the Annual Reproductive Cycle and Imposex Phenomenon of the Rock-Shell, Thais clavigera in Jeju Port

제주항 내에 서식하는 신복족류 Thais clavigera의 연중 생식주기 및 임포섹스 현상에 관한연구

  • Yang, Hyun-Sung (Faculty of Marine Biomedical Sciences (POST BK 21), Jeju National University) ;
  • Kim, Bong-Kyu (Faculty of Marine Biomedical Sciences (POST BK 21), Jeju National University) ;
  • Park, Heung-Sik (Marine Living Resources Research Department, Korea Ocean Research & Development Institute) ;
  • Choi, Kwang-Sik (Faculty of Marine Biomedical Sciences (POST BK 21), Jeju National University)
  • 양현성 (제주대학교 해양과학대학 해양의생명과학부) ;
  • 김봉규 (제주대학교 해양과학대학 해양의생명과학부) ;
  • 박흥식 (한국해양연구원 해양생물자원연구부) ;
  • 최광식 (제주대학교 해양과학대학 해양의생명과학부)
  • Received : 2009.12.29
  • Accepted : 2010.02.11
  • Published : 2010.03.31
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Abstract

Annual gonad development of the rock shell, Thais clavigera distributed in Jeju Port was investigated over a 12 month period from March 1998 to February 1999. Monthly change in gonad development was examined using histology. Gametogenesis of T. clavigera in the study area initiated as early as in October and fully ripe eggs could be observed from May to July. Percent gonad area (PGA) also increased rapidly from May to July then dropped in August when the water temperature remained $22.6-24.5^{\circ}C$, suggesting that rock shell released their eggs during this period. All female rock shell collected during the course of study exhibited pseudo-penis in the head, indicating that a certain level of imposex had progressed in the study site. Relative penis size index (RPSI), an indicator of level of imposex phenomenon varied 59.5-173.4% and this value was relatively higher than the index reported from elsewhere. It was believed that such imposex phenomenon observed in T. clavigera was caused by endocrine disruption by chemical contaminants such as TBTs released from biocidal paints in the port environment.

제주 항 내에 서식하는 대수리 Thais clavigera를 조직학적 방법을 이용하여 1998년 3월부터 1999년 2월까지 생식소 발달과 생식주기 그리고 imposex 현상에 대해 조사하였다. 조직학적 관찰 결과, 배우자형성은 암,수 모두 10월에 처음 시작 되었고, 성숙한 알들은 주로 5월에서부터 7월 사이에 관찰되었다. 생식소단면적 지수 역시 알이 성숙하는 5월과 7월 사이 급격히 증가하였으며, 8월에 급격히 낮아져, 7월과 8월 사이에 집중적인 산란이 있었던 것으로 사료되었다. 유기주석화합물에 의한 imposex 현상의 진행 정도를 나타내는 RPSI는 월 평균 59.5-173.4%로 다른 지역에 비하여 비교적 높게 나타났으며, 이는 제주 항 내의 유기주석화합물에 의한 것으로 추정되었다.

Keywords

References

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