In selected mining sinkhole ponds and sand-pits in the Upper-Silesian Industrial Region there were collected 346 sunbleak, in the age classes 1-5, with mean length and body weight 4.5 cm and 1.34 g, respectively. In the infected fish there were found: adult cestodes Caryophyllaeides Jennica, plerocercoids of Ligula intestinalis and Schistocephalus solidus, metacercariae of the trematode Posthodiplostomum cuticola, as well as two crustaceans Lernea cyprinacea and Argulusfoliaceus. In the case of the infection with plerocercoids of both cestodes distincly greater prevalence of the infection was observed in sand-pits, whereas maximal prevalence of the infection with the crustacean Argulus foliaceus - in examined sinkhole ponds. Authors discuss this phenomenon in the context of differences in temperature and oxygen conditions in both types of analyzed reservoirs.