전자저널 > 전자저널 > Studies on Reproductive Ecology and Parasite of the Venus Clam, Cyclina sinensis, on the West Coast of Korea. 2. On the Metacercaria of Himasthla kusasigi Yamaguti, 1939 (Trematoda) found in the Venus Clam, Cyclina sinensis

Studies on Reproductive Ecology and Parasite of the Venus Clam, Cyclina sinensis, on the West Coast of Korea. 2. On the Metacercaria of Himasthla kusasigi Yamaguti, 1939 (Trematoda) found in the Venus Clam, Cyclina sinensis

Young Gill Kim, Ee-Yung Chung and Yong Ho Kim

Faculty of Marine Life Science, College of Marine Science and Technology, Kunsan National University, Kunsan, 573-702 Korea

We investigated the effects of death and gametogenesis by infection of the trematode in the venus clam, Cyclina sinensis. The specimens of C. sinensis were collected monthly at the tidal flat of Kaehwado, Puan-gun and Sangpo aquafarms, Kochang-gun, Chollabuk-do, Korea, from June 1999 to May 2000. One species of a trematode, the metacercaria of Himasthla kusasigi Yamaguti, 1939 (Echinostomatidae), was found in the venus clam, C. sinensis. Infection rates in Kaehwado area and Sangpo aquafarm were average 93% and 81%, respectively. Infection rates during the study period reached the maximum (100%) in September 1999 and March-April 2000 and showed the minimum (80%) in July in Kaehwado, while those in Sangpo aquafarm showed the maximum (99%) in January 2000 and the minimum (47%) in November 1999. The infection parts of the metacercaria of H. kusasigi in the venus clam were the visceral mass, gill, mantle including the foot. Their infection rates in Kaehwado area and Sangpo aquafarm were 76.7% and 81.3% in the visceral mass, 19.1% and 14.5% in the gill, and 5.1% and 4.2% in the mantle, respectively. Infection rates of H. kusasigi showed higher with the increase of the size of the clams. No abnormal characteristics in the various tissues by histological observations were found in the clams infected by the metacercaria of H. kusasigi because this clam is the second intermediate host.

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