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Korean J Parasitol > Volume 23(1):1985 > Article

Original Article
Korean J Parasitol. 1985 Jun;23(1):18-23. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1985.23.1.18
Copyright © 1985 by The Korean Society for Parasitology
Studies on intestinal tematodes in Korea XVI. Infection status of loaches with the metacercariae of Echinostoma hortense
Jong Yil Chai,Sung Jong Hong,Woon Mok Sohn,Soon Hyung Lee and Byong Seol Seo
Department of Parasitology and Institute of Endemic Diseases, Collge of Medicine, Seoul National University, Seoul 110, Korea.

The infection status of the loaches, Misgurnus anguillicaudatus, with the metacercariae of Echinostoma hortense, was studied in Korea. A total of 154 loaches purchased at 4 local makets (Seoul, Kimhae, Naju-gun and Kangjin-gun) were examined their infection rate as well as the density and location of the metacercariae in the fish body. The results are as follews: The loaches carrying the metecercariae of E. hortense were 64 (41.6%) in total number and the metacercarial density ranged 1-29 per infected loach with an average value of 8.1. The highest infection rate and metacercarial density were obtained from the loaches purchased at Kangjin-gun, Jeonranam-do. The metacercaria of E. hortense were chiefly distributed in the distal intestinal wall and the adjacent mesentery, the perianal tissues, and the head and gill of the loaches examined. From the results, it is concluded that the loach is one of the important second intermediate hosts of E. hortense in Korea, and their infection rate and metacercarial density are considerably high.


Explanation of Figures
Fig. 1. Encysted metacercaria of E. hortense, unpressed (scale: 30µm).

Fig. 2. Another metacercaria showing the characteristic structures of collar spines, suckers and excretory bladder with large corpuscles, pressed specimen (scale: 30µm)

Fig. 3. Magnification of Fig. 2. The dorsally uninterrupted collar spines (arrow heads) are seen (scale: 20µm).

Fig. 4. Another metacercaria in the perianal tissue of a loach. Note 4 end group spines (circles) at both sides of the oral sucker (scale: 20µm).

Fig. 5. An excysted metacercaria showing the oral sucker with collar spines, ventral sucker and excretory bladder. Note 4 end group spines (circles) (scale: 50µm).

Fig. 6. Magnification of Fig. 5, showing the spines of end groups (circles) and several lateral ones (scale: 20µm).

Fig. 7. Dorsal view of the oral sucker of another metacercaria showing the dorsally uninterrupted collar spines (scale: 20µm).


Table 1
Intfection status of the loaches with the metacercariae of c

Table 2
Location of E. hortense metacercariae in body of the loaches

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