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Parasit Host Dis > 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

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