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Korean J Parasitol > Volume 29(3):1991 > Article

Brief Communication
Korean J Parasitol. 1991 Sep;29(3):311-313. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1991.29.3.311
Copyright © 1991 by The Korean Society for Parasitology
Infection status of Pseudorasbora parva collected from the Sunam stream with metacercariae of Metorchis orientalis
W M Sohn
Department of Parasitology, College of Medicine, Inje University, Pusan 614-735, Korea.

This study revealed the infection status of P. parva with the metacercariae of M. orientalis in the Sunam stream of the Nakdong River, a well-known focus of Clonorchis sinensis. A total of 60 P. parva were divided into 4 groups by the size (80-90, 70-79, 60-69 and 50-59 mm) and were digested by pepsin-HCl solution in a 36℃ incubator. The metacercariae of M. orientalis were collected and counted under a stereomicroscope. A total of 3,885 metacercariae were found, and average number/fish in each group were 143, 54, 23 and 40. They were 175.3 × 155.4 µm in average size and had thick cyst wall(13.1 µm in average). By the results, it is proved that the life cycle of M. orientalis is actively maintained in the Sunam stream of the Nakdong River.


Figs. 1-2
Fig. 1. Metacercariae of Metorchis orientalis (large-sized) and Clonorchis sinensis(smaller).

Fig. 2. Metacercaria of M. orientalis, showing the thick cyst wall, two suckers and excretory bladder(EB).

*Bar unit is micrometer.


Table 1
Infection status of Metorchis orientalis metacercariae in P. parva from the Sunam stream

Table 2
Metacercaria of M. orientalis metacercariae form P. parva

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