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Studies on the life-cycle of Asymphylodora tincae Modeer, 1790) Trematoda: Monorchiidae) in a small lake near Amsterdam: Part 2: The relations between Asymphylodora tincae and its definitive host, Tinca tinca

Published online by Cambridge University Press:  05 June 2009

M. A. Zietse ,
Elisabeth Van Den Broek  and
Elze E. A. Erwteman-Ooms
Elisabeth Van Den Broek
Affiliation:
Department of Aquatic Ecology, University of Amsterdam, Kruislaan 320,1098 SM Amsterdam, Netherlands
Elze E. A. Erwteman-Ooms
Affiliation:
Department of Aquatic Ecology, University of Amsterdam, Kruislaan 320,1098 SM Amsterdam, Netherlands
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Abstract

The natural infection of tench by Asymphylodora tincae in a lake was studied during one summer season. The incidence of infection was 57%, the mean intensity about 50. The distribution of the digencans along the host's intestine showed a maximum in the second half; this could be modified by the presence of other helminth species. Tench caught in early spring and kept in the laboratory retained their natural infection throughout the summer. Starvation of hosts during two months caused disappearance of the infection. Experiments showed that metaecrcariae, introduced into the intestine of tench, can excyst within one hour. In vitro, cysts in contact with tench bile opened within 15 seconds. Bile of several other cyprinid fisli species caused excystment within 60 seconds. Asymphylodora eggs appeared in tench faeces 7 to 10 days after infection. Progenetic specimens of A. tincae probably disintegrate in the intestine of the tench and their eggs arc passed out with the faeces.

Type
Research Article
Information
Journal of Helminthology , Volume 55 , Issue 4 , December 1981 , pp. 239 - 246
Copyright
Copyright © Cambridge University Press 1981

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