Original paper

Population dynamics of Capriniana piscium (Ciliophora, Suctoria) on the gill surface of Arctic char (Salvelinus alpinus) from high mountain lakes

Hofer, Rudolf; Salvenmoser, Willi; Fried, Johannes

Abstract

Gills of Arctic char (Salvelinus alpinus) from an oligotrophic high mountain lake (Oberer Plenderlesee, Austria) were heavily infected with Capriniana piscium (a commensalic ciliate) displaying a distinct seasonal pattern with a maximum abundance in autumn and early winter and a minimum between late winter and summer. There was no evidence of tissue damage caused by C. piscium, and the rate of infection did not directly correlate with physical and chemical water parameters. Thus, the increase of the pelagic ciliate community during the ice-free period may have a major impact on the specific population dynamics of C. piscium as it represents its major food source.

Keywords

soft water lakesseasonal dynamicsfishciliates