Bacteria and parasites on the gills of pike Esox lucius L. and tench Tinca tinca (L.) as indices of the trophic level of Oświn Lake (Northeastern Poland)

Teresa Własow; Izabella Zmysłowska; Dorota Lewandowska; Katarzyna Mierzejewska; Robert Idzikowski; Elżbieta Ziomek

Teresa Własow
Izabella Zmysłowska
Dorota Lewandowska
Katarzyna Mierzejewska
Robert Idzikowski
Elżbieta Ziomek

Keywords: BACTERIA, PARASITES, PIKE (ESOX LUCIUS), TENCH (TINCA TINCA), LAKE WATER

Abstract

The presence of bacteria and parasites on the gills of pike and tench from Oświn Lake in the Seven Islands Reserve was investigated. Parallel bacteriological analyses of the water were done. The materials were sampled in May-June, July, October 1999, six years after the water level had been increased. The bacteriological and parasitological results both indicate that this body of water is eutrophic. The increase in the incidence of infection with Ergasilus sieboldi and an increase in the number of heterotrophic bacteria were observed simultaneously on the gills. Based on the parasitological and microbiological analysis of gills, the prognosis for the health of pike is unfavorable.

CORRESPONDING AUTOR: Dr hab. Teresa Własow, prof. UWM, Uniwersytet Warmińsko-Mazurski, Katedra Ekologii Ewolucyjnej, Zakład Genetyki Ewolucyjnej, ul. Oczapowskiego 5, 10-719 Olsztyn;
tel. (89) 523-42-27, e-mail: tewlasow@uwm.edu.pl