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Report on the Annual Reproductive Cycle and Imposex Phenomenon of the Rock-Shell, Thais clavigera in Jeju Port  

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)
Publication Information
The Korean Journal of Malacology / v.26, no.1, 2010 , pp. 97-105 More about this Journal
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.
Keywords
Thais clavigera; Gamegogenesis; Reproduction; Imposex;
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