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|Title:||Parasite Community and Mortality of Over-Wintering Young-of-the-Year Roach (Rutilus Rutilus)|
|Authors:||KNOPF Klaus; KRIEGER Antje; HOELKER FRANZ|
|Citation:||JOURNAL OF PARASITOLOGY vol. 93 no. 5 p. 985-991|
|Publisher:||AMER SOC PARASITOLOGISTS|
|Type:||Articles in periodicals and books|
|Abstract:||The composition and development of the parasite community of over-wintering young-of-the-yr (YOY) roach (Rutilus rutilus) was studied in ponds under outdoor-conditions. Cumulative mortality of the roach from November until May was about 20%. The prevalences of the epizoic ciliates Trichodina sp. and Apiosoma sp., and of the monogeneans Dactylogyrus suecicus, Dactylogyrus nanus, and Gyrodactylus sp. in general tended to peak in the beginning of April at a water temperature of about 8 C. However, the mean intensity of these parasites remained constant. Metacercariae of the digeneans Diplostomum cf. spathaceum and Tylodelphys clavata were found with unchanged prevalences. Larvae of the nematode Philometra obturans and the cestode Ligula intestinalis, and females of the copepod Neoergasilus japonicus were only found sporadically. A concept of 2 thresholds, the critical condition factor (attained by a temperature-induced energy deficiency) and a condition-dependent critical infection intensity, which determine winter mortality of YOY, is suggested.|
|JRC Directorate:||Space, Security and Migration|
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