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Larval gryporhynchid tapeworms (Cestoda: Cyclophyllidea) of British freshwater fish, with a description of the pathology caused by Paradilepis scolecina

Published online by Cambridge University Press:  31 January 2011

C.F. Williams ,
A.J. Reading ,
T. Scholz  and
A.P. Shinn
C.F. Williams*
Affiliation:
Environment Agency, Bromholme Lane, Brampton, CambridgeshirePE28 4NE, England, UK
A.J. Reading
Affiliation:
Environment Agency, Bromholme Lane, Brampton, CambridgeshirePE28 4NE, England, UK
T. Scholz
Affiliation:
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05České Budejovice, Czech Republic
A.P. Shinn
Affiliation:
Institute of Aquaculture, University of Stirling, StirlingFK9 4LA, Scotland, UK
*
*Fax: +44 01480 433873 E-mail: [email protected]
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Abstract

Larvae of the cyclophyllidean tapeworms Paradilepis scolecina (Rudolphi, 1819), Neogryporhynchus cheilancristrotus (Wedl, 1855) and Valipora campylancristrota (Wedl, 1855), are described from British freshwater fish. The morphometrics of the rostellar hooks, infection characteristics and host ranges of these parasites from fisheries in England and Wales are presented. Difficulties in the detection, handling and identification of these tapeworms are highlighted, and may in part explain the paucity of records from Britain. Tissue digestion was shown to be a useful technique for the examination of these parasites, providing clear and consistent preparations of the rostellar hooks for measurement. The pathological changes caused by P. scolecina to the liver of wild tench, Tinca tinca, are detailed for the first time. Tapeworms located in the hepatic parenchyma and pancreatic tissues caused little pathological damage and invoked only mild inflammatory responses. The small size of these tapeworms and their encapsulation within host tissues appear to limit the severity of pathology, compared with parasites that insert their rostellum during attachment.

Type
Research Papers
Information
Journal of Helminthology , Volume 86 , Issue 1 , March 2012 , pp. 1 - 9
Copyright
Copyright © Cambridge University Press 2010

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