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Korean J Parasitol > Volume 34(2):1996 > Article

Original Article
Korean J Parasitol. 1996 Jun;34(2):95-105. English.
Published online Jun 20, 1996.  http://dx.doi.org/10.3347/kjp.1996.34.2.95
Copyright © 1996 by The Korean Society for Parasitology
The infestation states and changing patterns of human infecting metacercariae in freshwater fish in Kyongsang-do and Kyonggi-do, Korea
H J Rim,1K H Kim,*2K H Joo,1S J Kim,3K S Eom,4 and M S Chung5
1Department of Parasitology, College of Medicine, Korea University, Seoul 136-705, Korea.
Received January 20, 1996; Accepted April 30, 1996.

Abstract

The infestation rates and abundances of human infecting metacercariae (Clonorchis sinensis, Metagonismus spp., Centrocestus armatus, Echinostoma hortense, Echinochasmus japonicus, Clinostomum complanatum) in freshwater fish were investigated at the three river areas- Taewhagang (river), Hyongsangang(river), Nakdonggang(river) -in Kyongsang-do and at four streams-Yonpungchon, Munsanchon, Kyonganchon, and Konjiamchon-in Kyonggi-do, Korea in 1994-1995. The fish caught at Taewhagang were heavily infested with metacercariae of Clonorchis sinensis and Centrocestus armatus. At Hyongsangang, Zacco platypus and Z. temmincki were moderately infested with metacercariae of C. armatus. Chomanpo, at the basin of Nakdonggang, was still endemic for C. sinensis. In the fish caught at four streams of Kyonggi-do, metacercariae of C. sinensis exhibited the highest infestation rate and intensity out of 6 species of metacercariae. The infestation intensity of C. sinensis metacercariae in fish flesh was markedly different according to each division of flesh. The cause of this difference was conjectured as a result of larval behavior. The metacercariae of C. armatus were found in almost all parts, except scales and fins, of fish. The infestation rates and intensities of C. sinensis and C. armatus metacercariae in Taewhagang greatly increased as compared with those of previous reports. Rhinogobius brunneus and Acanthorhodeus macropterus are newly recorded intermediate hosts of Echinostoma hortense. The reason of large differences from previous data was discussed and the standard method of metacercaria examination was proposed.

Figures


Fig. 1
The photographs of each species acquired from infection experiments. A.Centrocestus armatus (× 200) - the source of metacercarias is Z. platypus. B.Echinochasmus japonicus (× 100) - the source of metacercariae is P. parva. C-D.Echinostoma hartense - the source of metacercariae is R. brunneus. C. The anterior region of Echinostoma hortense (× 100). D. The circumoral spines of E. hortense (× 200). E. The terminal region of genital organs of E. hortense (× 200) (sv, seminal vesicle; cr, cirrus).

Tables


Table 1
The infestation rates and abundances of metacercariae according to the fish hosts and the samping localities


Table 2
The total number of C. sinensis metacercariae in various parts of fish hosts


Table 3
The total number of C. armatus metacercariae in various parts of fish hosts


Table 4
The approximate quantity of metacercariae in two streams from the first survey


Table 5
The infestation rates and abundances of metacercariae according to the fish hosts and the sampling localities


Table 6
The distribution states of C. sinensis metacercariae in various parts of fish hosts


Table 7
Comparison of infestation states of metacercariae with the previous reports in Taewhagang


Table 8
Comparison of infestation states of metacercariae with the previous reports in Hyongsangang

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