Eimeria spp. from cyprinid fish of the Duero basin (north-west Spain)

Abstract. We describe three Eimeria spp. from extraintestinal sites of cyprinid fish of the Esla River; Eimeria leucisci from Barbus barbus bocagei, E. rutili from Leuciscus cephalus cabeda and Chondrostoma polylepis polyiepis and E. baueri sp. nov. from Carassius carassius . Data on the prevalence and intensity are given. Histopathological changes of the barbel kidney affected by E. leucisci are described. In the analysis of the population dynamics, a clear pattern of seasonality cannot be deduced. Influence of host age was clear only for E. leucisci in which the prevalence decreased significantly with the age of the barbel. We did not observe a clear influence of host sex on the infections.