This report reveals a significant acidity of the River Raba at all the investigated sampling points, and rather poor differentiation of the zooplanktonic organisms. At one sampling point the presence of Paramecium biaurelia was registered.
Komala Z. Department of Experimental Zoology, Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Slawkowska 17, 31-016 Krakow, Poland