Analiza długotrwałego oddziaływania podwyższonej temperatury na helmintofaunę leszcza [Abramis brama] jeziora Gosławskiego

A total of 490 bream (Abramis brama) (250 individuals from the Gosławskie lake and 240 from the Gopło lake) were examined for helminths. The study was carried out within 2000−2002. Twenty−two helminth species were recovered: Dactylogyrus auriculatus (von Nordmann, 1832), Dactylogyrus falcatus (Wedl, 1857), Dactylogyrus sphyrna Linstow, 1878, Dactylogyrus wunderi Bychowsky, 1931, Dactylogyrus zandti Bychowsky, 1933, Gyrodactylus elegans von Nordmann, 1832, Diplozoon paradoxum von Nordmann, 1832, Tylodelphys clavata (von Nordmann, 1832), Ichthyocotylurus platycephalus (Creplin, 1825), Bucephalus polymorphus Baer, 1827, Posthodiplostomum cuticola (von Nordmann, 1832), Phyllodistomum elongatum Nybelin, 1926, Sphaerostomum bramae (Müller, 1776), Asymphylodora imitans (Mühling, 1898), Ligula intestinalis (Linnaeus, 1758), Caryophyllaeus laticeps (Pallas, 1781), Neogryporhynchus cheilancristrotus (Wedl, 1855), Raphidascaris acus (Bloch, 1779), Philometra ovata (Zeder, 1803), Acanthocephalus anguillae (Müller, 1780), Acanthocephalus lucii (Müller, 1776) and Acanthocephalus sp., and one taxon of the generic level (Diplostomum). Twenty−one taxa occurred in Gosławskie Lake, while nineteen were noted in the Gopło Lake. In this study the dominant were the digenean matacercariae (Diplostomum spp.) while in relation to the data from 1972−74 and 1982−84 that was Bucephalus polymorphus and Dactylogyrus wunderi. Plerocercoids Ligula intestinalis was recorded for the first time in muscle of bream.