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Life history of the nematode Rhabdochona hellichi, a parasite of the barbel in the Jihlava River, Czech Republic

Published online by Cambridge University Press:  05 June 2009

F. Moravec  and
T. Scholz
F. Moravec
Affiliation:
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic
T. Scholz
Affiliation:
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic
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Abstract

From April 1992 until June 1993, the seasonal dynamics of Rhabdochona hellichi (Šrámek 1901) in its definitive host, the barbel (Barbus barbus), was studied in the Jihlava River (the Danube basin), Czech Republic. The parasite occurred in barbel throughout the year (overall prevalence 93% and intensity of infection 1–1384 [mean 78] nematodes per fish), but there were distinct seasonal fluctuations in prevalence and mean intensity values associated with the parasite's seasonal cycle of maturation. Prevalence was very high (usually 100%) during most months of the year, while lowest values were recorded in August and October. The highest values of mean intensity occurred in April. Both prevalence and mean intensity values increased with the body length of the hosts. The parasite exhibited a distinct annual cycle of maturation with egg-producing females present only fmm June until August, whereas larvae occurred in barbel mostly from September until April of the next year. Trichopteran (caddis-fly) larvae of the genus Hydropsyche (H. angustipennis and H. pellucidula) were found as natural intermediate hosts of R. hellichi (prevalence 4%, intensity 1–10 nematode larvae). The strictly seasonal maturation of this nematode may be associated with the temperature regime in the locality and seasonal cycles of maturation of its intermediate hosts.

Type
Research Papers
Information
Journal of Helminthology , Volume 69 , Issue 1 , March 1995 , pp. 59 - 64
Copyright
Copyright © Cambridge University Press 1995

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