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KMID : 0980720080270010016
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Keimyung Medical Journal
2008 Volume.27 No. 1 p.16 ~ p.31
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Recent Patterns of Infections with Digenetic Larval Trematodes from Fresh-water Fish in River Cheongdo,Kyongbuk Province,Korea
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Joo Chong-Yoon
Baek Eun-Hee
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Abstract
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Recent pattern of infections with digenetic larval trematodes from fresh- water fish was studied in three locations of the River Cheongdo during the period from March to November, 2007, and compared with the data reported previously in the same river. The fish were collected using following techniques: fishing, throwing a castnet, and using a bait of crushed oil cake in a transparent plastic bowl. Of 18 species of fish examined, 11 species of encysted larvae, Clonorchis sinensis, Cyathocotyle orientalis, Centrocestus armatus, Clinostomum complanatum, Exorchis oviformis, Echinochasmus species, Holostephanus species, Metagonimus species, Metacecaria hasegawai, and Metorchis orientalis, Pseudexorchis major and two kinds of undetermined cyst A and C were found. The encysted larvae of Cyathocotyle orientalis and Metacercaria hasegawai were found most frequently from 13 species of fresh-water fish, followed by Exorchis oviformis larvae from 10 species, the cyst of Metagonimus species from 9 species, Clonorchis sinensis from 8 species, Clinostomum complanatum from 6 species, and Centrocestus armatus, Echinochasmus species, Metorchis orientalis, and Pseudexorchis major from 2 species. The infection rates of fish with Clonorchis sinensis larvae were lower than those
reported in 2002, whereas their intensity of infection was found lowered in 3 species, Pungtungia herzi, Saurogobio dabryi, and Squalidus japonicus coreanus. The infection rates and intensity of 6 species of fish with Metagonimus species larvae were lower than the results in 2002, while the rates in several species of fish with Exorchis oviformis rather higher. The encysted larvae of Cyathocotyle orientalis, Metacercaria hasegawai, and Metorchis orientalis showed variations in
infection rates of fish in 2002 and in the present study. However, it was impossible to compare the infection rates for the encysted larvae on the scales, fins and tail as they varied so considerably in both 2002 and 2007 surveys. This study indicates that the rate of infection with digenetic larval trematodes in fresh-water fish was still relatively high in the River Cheongdo, and the metacercarial burden in the fish varies greatly by different fish in 2002.
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KEYWORD
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Centrocestus amatus, Clinostomum complanatum, Clonorchis sinensis, Digenetic larval trematodes, Exorchis oviformis, Fresh-water fish, River Cheongdo Metacercarial burden
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