THE PARASITES OF BREAM ABRAMIS BRAMA (L.) FROM LAKE KORTOWSKIE
University of Warmia and Mazury in Olsztyn, Poland
Abstract. The parasites of bream from the reclaimed Lake Kortowskie were comprised of 16 species belonging to Protozoa, Monogenea, Digenea, Cestoda, Acanthocephala, Nematoda, Crustacea and Molusca. Some parasites were found only on single host specimens (Trichodina sp., Gyrodactylus sp., Ichthyocotylurus platycephalus met., Glochidium lar.). The other species (Dactylogyrus auriculatus, Phyllodistomum elongatum, Acanthocephalus lucii, Philometra sp.) occurred rarely and with low intensity. A comparative study of the infestation of bream from Lake Kortowskie in the 1984-1994 period indicated that while the number species in the parasite community remained unchanged (16 species), the set of parasites differed distinctly (seven species disappeared and seven others appeared). The frequency of four species, E. sieboldi, Myxobolus sp., Trichodina sp. and Philometra sp., decreased, that of Tylodelphys clavata increased, while four others, Gyrodactylus sp., Diplostomum sp., Caryophyllaeus laticeps, Glochidium lar., occurred at the same level.
Key words: ABRAMIS BRAMA, PARASITES, LAKE KORTOWSKIE
Ewa Dzika, Uniwersytet Warmińsko-Mazurski w Olsztynie, Katedra Zoologii, ul. Oczapowskiego 5, 10-718 Olsztyn; Tel./Fax: +48 98 523385