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The migration of Cercaria X Baylis (Strigeida) within the fish intermediate host

Published online by Cambridge University Press:  06 April 2009

David A. Erasmus
David A. Erasmus
Affiliation:
Department of Zoology, University College, Cardiff
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1. Studies, using serial sections and a method of numerical assessment of the, numbers of cercariae in the various tissues, have shown that cercarial entry occurs through the skin at any point along the length of the fish and also through the gills and pharynx in the head region. The distribution of penetration along the length of the body is not uniform but exhibits a marked concentration in the head region.

2. As the time after infection increases, this initial unimodal distribution is maintained and becomes even more restricted.

3. Nearly all the cercariae have localized in the eye 12–24 hr. after infection. The few that remain outside the eye after this period appear to be moribund and undergoing phagocytosis.

4. The majority of migrating cercariae are present in connective tissue and muscle. Very few occur in the blood system and even fewer in the other organs of the body. The numbers in the blood system show a local anterior concentration in the blood vessels anterior to the heart and in the region of the gills. It seems probable that the blood system does not form the major route of migration.

5. Entry into the eye may occur at any point.

6. Cercarial migration causes extensive tissue damage, but this is fatal only when major blood vessels are perforated and severe internal haemorrhage results. Interference with the nervous system and lateral line system may be the cause of the orientation disturbances which are sometimes noted within 12 hr. after infection.

7. It is suggested that migration through the tissues is achieved mainly by the action of the anterior spination and that the function of the penetration gland cells may be lubricatory and/or adhesive rather than lytic.

8. The restricted tissue distribution during migration and the retention of an essentially unimodal distribution of cercariae along the length of the body through-out the whole period of migration suggest that localization in the lens is not achieved by chance migration.

Type
Research Article
Information
Parasitology , Volume 49 , Issue 1-2 , May 1959 , pp. 173 - 190
Copyright
Copyright © Cambridge University Press 1959

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References

REFERENCES

Blochmann, F. (1910). Sterben von Aquarienfischen durch Einwanderung von Cercaria fissicauda La Val. Zbl. Bakt. 56, 47–9.Google Scholar
Carleton, H. M. & Leach, E. H. (1938). Histological Technique, 2nd ed.London: O.U.P.Google Scholar
Davis, D. J. (1936). Pathological studies on the penetration of the cercariae of the strigeid trematode Diplostomum flexicaudum. J. Parasit. 22, 329–38.CrossRefGoogle Scholar
Dubois, G. (1929). Les cercaires de la region de Neuchâtel. Bull. Soc. neuchâtel. Sci. nat. 53, 3–177.Google Scholar
Erasmus, D. A. (1958 a). Notes on the use of electronic flash in photomicrography. Nature, Lond., 181, 1290.CrossRefGoogle Scholar
Erasmus, D. A. (1958 b). Studies on the morphology, biology and development of a strigeid cercaria (Cercaria X Baylis, 1930). Parasitology, 48, 312–35.CrossRefGoogle ScholarPubMed
Ferguson, M. S. (1943). Migration and localization of an animal parasite within the host. J. Exp. Zool. 93, 375–403.CrossRefGoogle Scholar
Hunter, G. W. & Hamilton, J. M. (1941). Studies on host-parasite reactions to larval parasites. IV. The cyst of Uvidifer amploblitis. Trans. Amer. Micr. Soc. 60, 498–507.CrossRefGoogle Scholar
Kruidenier, F. J. (1951). The formation and function of mucoids in virgulate cercariae including a study of the virgulate organ. Amer. Midi. Nat. 46, 660–86.CrossRefGoogle Scholar
Kruidenier, F. J. (1953). Studies on the function of mucoids in cercariae: non-virgulate Xiphidiocercariae. Amer. Midi. Nat. 50, 382–97.CrossRefGoogle Scholar
Leweet, R. M. & Lee, C. L. (1954). Studies on the passage of helminth larvae through host tissues. I. Histochemical studies on the extracellular changes caused by penetrating larvae. II. Enzymatic activity of larvae in vivo and in vitro. J. Infect. Dis. 95, 13–51.Google Scholar
Smith, G. M. (1931). The occurrence of melanophores in certain experimental wounds of the goldfish Carassius auratus. Biol. Bull. 61, 73–84.CrossRefGoogle Scholar
Steenstrup, J. J. (1845). On the alternation of generations. Translated from the German version of C. H. Lorenzen by George Busk. Bay Soc. Monog.Google Scholar
Stirewaxt, M. A. & Hackey, J. (1956). Penetration of host skin by cercariae of Schistosoma mansoni. I. Observed entry into skin of mouse, hamster, rat, monkey and man. J. Parasit. 42, 565–80.CrossRefGoogle Scholar
Szidat, L. (1924). Beiträge zur Entwickelungsgeschichte der Holostomiden. II. Zool. Anz. 61, 249–66.Google Scholar
Wesenberg-Lund, C. (1934). Contributions to the development of the Trematoda Digenea. Part II. The biology of the freshwater cercariae in Danish freshwaters. K. danske vidensh. Selsk. (Sec. Sci. 9), Ser 5, 1–223.Google Scholar