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Host specificity and geographical distribution of Eubothrium in European salmonid fish

Published online by Cambridge University Press:  12 April 2024

T. Scholz*
Affiliation:
Institute of Parasitology, Academy of Sciences of the Czech Republic, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
R. Kuchta
Affiliation:
Faculty of Biological Sciences, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
A.P. Shinn
Affiliation:
Institute of Aquaculture, University of Stirling, Stirling, FK9 4LA, Scotland, UK
V. Šnábel
Affiliation:
Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01 Košice, Slovak Republic
V. Hanzelová
Affiliation:
Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01 Košice, Slovak Republic
*
*Fax: 00420 38 53 10 388 E-mail: tscholz@paru.cas.cz

Abstract

The host specificity and distribution of Eubothrium crassum (Bloch, 1779) and Eubothrium salvelini (Schrank, 1790), morphologically fairly similar pseudophyllidean tapeworms parasitizing salmonid fish, were critically assessed on the basis of morphological and genetic evaluation of extensive material collected from different definitive hosts and geographical regions in Europe. Eubothrium crassum occurs in fish of the genera Salmo, i.e. salmon (S. salar – both freshwater and marine), sea trout (S. trutta trutta), brown trout (S. trutta fario), and lake trout (S. trutta lacustris), and also in Danubian salmon (Hucho hucho) and vendace (Coregonus albula). Eubothrium salvelini parasitizes Arctic char (Salvelinus alpinus) and brook trout (Salvelinus fontinalis) in Europe, and also whitefish (Coregonus wartmanni). Rainbow trout (Oncorhynchus mykiss), which is not a native European fish species, was found to be a suitable definitive host for both Eubothrium species, which may occur simultaneously in the same fish. Previous records of E. crassum in Arctic char and brook trout, and those of E. salvelini in fish of the genus Salmo were most probably misidentifications. Most studies of Eubothrium have involved salmonids from the northern part of Europe, with few records from southern and south-eastern Europe. This study also confirmed the reliability of the morphology of the apical disc for the discrimination of E. crassum and E. salvelini.

Type
Review Article
Copyright
Copyright © Cambridge University Press 2003

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