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Larval anisakids collected from the yellow corvina in Korea
Jong Yil Chai,Yeon Myung Chu,Woon Mok Sohn and Soon Hyung Lee
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Seoul 110, Korea.
Abstract
Larval anisakids found in the yellow corvina (Pseudosciaena manchurica), a marine fish caught in the Yellow Sea, were classified by their morphological types. Total 1,068 anisakid larvae were collected from 30 fish examined, with the average number per fish of 35.6. They were classified into Anisakis type I larvae of Berland (859 in number, 80.4%), Contracaecum type A of Koyama et al. (13, 1.2%), Contracaecum type C'(new type) (55, 5.1%), Contracaecum type D of Koyama et al.(18, 1.7%), Contracaecum type D'(new type) (77, 7.2%), Contracaecum type V of Yamaguti(3, 0.28%), Raphidascaris sp. of Koyama et al. (1, 0.09%) and unidentified (42, 3.9%). Contracaecum type C' and D' were considered new in the literature.
Figures
Figs. 1-16 Fig. 1.Anisakis type I larva, anterior portion. Boring tooth is prominent (arrow) on the lip mass. ×200.
Fig. 2.Ibid, ventricular portion. Note the large size of ventriculus and its oblique junction with the intestine (arrows) ×100.
Fig. 3.Ibid, posterior portion. There is no recognizable genital organ. ×40.
Fig. 4.Ibid, terminal portion. The tail is broad and round, ending with a mucron (arrow). ×200.
Fig. 5.Contracaecum type A of Koyama et al. (1969) head portion. ×200.
Fig. 6.Ibid, near ventricular portion. Note the short intestinal cecum (arrows; up) and small ventriculus (arrows; down). ×200.
Fig. 7.Ibid, middle portion of the body, Convoluted genital anlage is seen. ×200.
Fig. 8.Ibid, terminal portion, consisted of about 10-20 minute spines (arrow). ×200.
Fig. 9.Contracaecum type C' (new type), head portion. Boring tooth (arrow), interlabia and excretory pore (EP) are seen. ×200.
Fig. 10. (a) Ibid, anterior portion. Intestinal cecum (arrow) extended up to the middle portion of muscular esophagus. ×100. (b)Ibid, below the ventricular level. Ventricular appendage (arrow) is seen. ×200.
Fig. 11.Ibid, middle portion of the body. Genital organ is seen with convolutions. ×100.
Fig. 12.Ibid, terminal portion Note the short but pointed tail without a mucron. ×200.
Fig. 13.Contracaecum type D of Koyama et al. (1969) head portion. Boring tooth (arrow) and interlabia are present. ×200.
Fig. 14. (a) Ibid, esophago-ventricular level. Note anteriorly extended intestinal cecum (arrow) and small ventriculus(V). ×100. (b) Ibid, post-ventricular level. Note the nearly equal length of ventricular appendage (arrows) and intestinal cecum in Fig. 14a. ×100.
Fig. 15.Ibid, middle portion of the body. Genital organ is seen on the left side of intestinal tract (IN). ×100.
Fig. 16.Ibid, terminal portion. Long and slender tail has a small mucron (arrow) at its pointed end. ×200.
Figs. 17-28 Fig. 17.Contracaecum type D' (new type), anterior portion. Boring tooth (arrow) and interlabia and present.Excretory pore (EP) is seen just behind the nerve ring. ×200.
Fig. 19.Ibid, middle portion of the body. Note the genital organs. ×100.
Fig. 20.Ibid, terminal portion. Relatively long and slender tail with no mucron is seen. ×200.
Fig. 21.Contracaecum type V of Yamaguti, head portion. Note boring tooth (arrow) and long muscular esophagus (ME). Excretory pore (EP) is seen behind the nerve ring. ×40.
Fig. 22.Ibid, esophago-ventricular portion. Note the short intestinal cecum (arrows). ×100.
Fig. 23.Ibid, posterior portion of the body, There is no genital organ. Note long ventricular appendage (arrow) reaching to this level. ×40.
Fig. 24.Ibid, terminal portion. Note the ventricular appendage (arrow). ×100.
Fig. 25.Raphidascaris sp., anterior portion. Note boring tooth (arrow) but there is no interlabia. Long muscular esophagus is seen. ×200.
Fig. 26.Ibid, ventriculo-intestinal junction. Note the ventricular appendage (arrows). ×200.
Fig. 27.Ibid, middle portion of the body. Note the genital organs. ×200.
Fig. 28.Ibid, terminal portion. Tail is relatively short and has a pointed end with a mucron. ×200.
Tables
Table 1 Measurements of Anisakis type I larvae in comparison with those of Koyama et al. (1969)
Table 2 Measurements of Contracaecum type A in comparison with those by Koyama et al. (1969)
Table 3 Measurements of Contracaecum type C' in comparison with type C of Koyama et al. (1969)
Table 4 Measurements of Contracaecum type D in comparison with those by Koyama et al. (1969)
Table 5 Measurements of Contracaecum type D' found in this study
Table 6 Measurements of Contracaecum type V in comparison with previous reports
Table 7 Measurements of Raphidascaris sp. in comparison with those by Koyama et al. (1969)
Table 8 Comparative morphological features of anisakid larvae collected from the yellow corvina
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