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Korean J Parasitol > Volume 30(3):1992 > Article

Original Article
Korean J Parasitol. 1992 Sep;30(3):157-162. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1992.30.3.157
Copyright © 1992 by The Korean Society for Parasitology
Infection status of the sea eel (Astroconger myriaster) purchased from the Noryangjin fish market with anisakid larvae
J Y Chai,S R Cho,J Kook and S H Lee
Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.

Although the sea eel (Astroconger myriaster) is suspected as one of the most important fish host for human anisakiasis in Korea, no report has been made on the infection status of the sea eel with anisakid larvae. In the present study, 26 sea eels (Astroconger myriaster) were purchased from the Noryangjin fish market in Seoul, and anisakid larvae were collected from their viscera, muscle, head and skin. The collected larvae were classified by their morphological types. A total of 1,351 anisakid larvae were collected from 15 of 26 fish examined. Among them, 1,269 were recovered from the viscera, 66 from the muscle, and 16 from the head and skin. Morphologically, most of the anisakids were classified into 6 known larval types, Anisakis type I (564 larvae) of Berland (1961), Contracaecum type A (409) and type D (5) of Koyama et al. (1969), Contracaecum type C' (83) and type D' (117) of Chai et al. (1986), and Contracaecum type V (1) of Yamaguti (1935). Remaining 172 specimens were new in the available literature, hence, designated as Contracaecum type A' (new type). The present results revealed that the sea eels caught in the Korean waters are heavily infected with anisakid larvae, not only in their viscera but also in the muscle, and Anisakis type I was the most common among the 7 larval types.


Figs. 1-5
Fig. 1.Contracaecum type A' (new type), head portion. Boring tooth and interlabia are present. ×200.

Fig. 2.Ibid, esophageal level. Note the anteriorly extended intestinal cecum (arrow). ×200.

Fig. 3.Ibid, middle portion of the body. Note the genital organs. ×200.

Fig. 4.Ibid, terminal portion. Note the long tail with mucron, consisted of about 7~12 minute spines (arrow). ×200.

Fig. 5.Contracaecum type A of Koyama et al.(1969), terminal portion. The short tail which consisted of about 15~30 spines(arrow) is different from the type A'. ×200.


Table 1
Number of anisakid larvae collected by the body part of the fish*

Table 2
Comparative morphological features of anisakid larvae collected from Astroconger myriaster

Table 3
Measurements of Contracaecum type A' (new type) in comparison with Contracaecum type A of Koyama et al. (1969)

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