| Home | E-Submission | Sitemap | Contact us |  
Korean J Parasitol > Volume 17(2):1979 > Article

Original Article
Korean J Parasitol. 1979 Dec;17(2):127-131. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1979.17.2.127
Copyright © 1979 by The Korean Society for Parasitology
Study on the frequency distribution of the metacercarial density of Clonorchis sinensis in fish host, Pseudorasbora parva
Yeun-Ki Kim,Shin-Yong Kang and Soon-Hyung Lee
Department of Parasitology, College of Medicine, Chung-Ang University, Korea.

Since the pattern of the frequency distribution of a parasite within a host showed an overdispersed pattern, various statistical models such as Poisson, negative binomial and lognormal distributions have been applied on the population dynamics in host-parasite relations.

The observed data on the number of metacercariae of Clonorchis sinensis in a suitable intermediate host, Pseudorasbora parva which were collected from an endemic area, Juk-Rim River, Kim-Hae Goon, South Kyong-Sang Do were applied on the statistical models.

The results obtained are as follows:

1. By the calculation of the raw data, 258(94.9 percent) out of 272 fish showed positive to the metacercarial infection of C. sinensis. The mean number of metacercaria in a fish was 335.1. The standard deviation was 250.6 and the mode was observed between 250 and 299.

2. The frequency distribution pattern of metacercariae of C. sinensis within the fish host in surveyed area was fitted to the lognormal distribution (0.05<p<0.10) rather than to the negative binomial (p<0.005) distribution.

From the above statistical analyses, it was concluded that the lognormal distribution was selected as a distribution pattern of metacercariae of C. sinensis in their suitable fish host.


Fig. 1
Histogram showing the frequency distribution of metacercariae of C. sinensis in Pseudorasbora parva.

Fig. 2
The observed and negative binomial theoretical frequencies of number of metacercariae per fish.

Fig. 3
The observed and lognormal theoretical frequencies of number of metacercariae per fish.


Table 1
Frequency distribution of metacercariae per fish in Clonorchis sinensis and the theoretical frequencies by lognormal and negative binomial distributions

1. Anderson RM, Whitfield PJ, Dobson AP. Experimental studies of infection dynamics: infection of the definitive host by the cercariae of Transversotrema patialense. Parasitology 1978;77(2):189–200.
2. Bliss CI. Biometrics 1953;9:176–196.
3. Boxshall GA. The population dynamics of Lepeophtheirus pectoralis (Muller): dispersion pattern. Parasitology 1974;69(3):373–390.
4. Chai JY, Cho SY, Kang SY, Seo BS. Frequency Distribution Of Enterobius Vermicularis In A Highly Endemic Population. Korean J Parasitol 1976;14(2):103–108.
5. Crofton HD. Parasitology 1971;62:179–193.
6. Crofton HD. A model of host-parasite relationships. Parasitology 1971;63(3):343–364.
7. Kang SY, Cho SY, Seo BS. Studies On The Lungfluke, Paragonimus Iloktsuenensis: IV. A Mathematical Analysis On Metacercarial Density Of Paragonimus Iloktsuenensis In Crab Host, Sesarma Dehaani. Korean J Parasitol 1975;13(1):31–37.
8. LI SY, HSU HF. On the frequency distribution of parasitic helminths in their naturally infected hosts. J Parasitol 1951;37(1):32–41.
9. Pennycuick L. Frequency distributions of parasites in a population of three-spined sticklebacks, Gasterosteus aculeatus L., with particular reference to the negative binomial distribution. Parasitology 1971;63(3):389–406.
10. Wada Y. Questiones Entomologicae 1965;1:187–222.
11. William CB. J Ecology 1944;32:1–44.
12. Schmid WD, Robinson EJ Jr. The pattern of a host-parasite distribution. J Parasitol 1972;58(5):907–910.
Editorial Office
c/o Department of Medical Environmental Biology
Chung-AngUniversity College of Medicine, Dongjak-gu, Seoul 06974, Korea
Tel: +82-2-820-5683   Fax: +82-2-826-1123   E-mail: kjp.editor@gmail.com
About |  Browse Articles |  Current Issue |  For Authors and Reviewers
Copyright © 2021 by The Korean Society for Parasitology and Tropical Medicine.     Developed in M2PI