| Recent Patterns of Infections with Digenetic Larval Trematodes from Fresh-water Fish in River
Cheongdo; Kyongbuk Province; Korea* |
| 경북 청도천에서 채집된 담수어에 있어서 흡충류 피낭유충의 최근 기생상 |
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주종윤; 백은희 |
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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. |
| Key Words:
Centrocestus amatus, Clinostomum complanatum, Clonorchis sinensis, Digenetic
larval trematodes, Exorchis oviformis, Fresh-water fish, River Cheongdo
Metacercarial burden |
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