In 1999 research on the range of pollution of fishes in antropogenie water ecosystem was carried out. These are the first results of investigation on heavy metals in fishes of this part of Upper Silesia region, especially in the dam-reservoir of the Kłodnica river. Concentration of Pb, Cd, Cu, Ni, Zn, Cr, Mn, in flesh and liver of some species of fish (Rutilus rutilus, Tinca tinca, Cyprinus carpio, Esox Lucius, Perea fluviatilis) in antropogenie ecosystem of water is given. The Dzierżno Duże dam-reservoir is artificial reservoir on the Kłodnica river, which flows through the Silesia region, the most industrialized region in Poland. The Coal-mine waters and other industrial pollution were collected in the sediments in this lake for years. The range of heavy metals concentration is higher than established standards for fish-food. The investigations will be continued.

In 1998 microbiological investigation of water on eleven sample points, of the greatest antropogenie reservoir in the West-part of Upper Silesian Region was carried out. Total numbers of psychrophiles, mesophiles, Coliform bacteria was determined. In the estuary of Kłodnica river Coli-coefficient was 0.00004, coefficient of Coli-faecal type was 0.0009. These values indicate severe water pollution with faecal matter over the standards for waters and sewage waters. With the distance from estuary of Kłodnica river microbiological pollution factors decrease was observed. After 1 km Coli-coefficient was 100-product decrease. In the sample point at the end of longitude profile, near the dam vicinity, values of those indicators successfully decreased to 0.1 of the Coli-form and 1 for Coli-faecal type. In the 4 sample points along the length of left bank of second part of reservoir (West-part) the differentiation of water quality was observed between I and III quality classes. Decrease of numbers of faecal streptococci by flow-line from 6000 in the estuary of the Kłodnica river to 15 in the pelagic point and 4 in the end of reservoir was determined. Decrease in microbiological factor is the greatest on the first 1000 meters of longitude profile of the reservoir. Very important in decrease of bacteria numbers is sedimentation process of alochtonie suspended solids.

The pathogenetic bacteria are in flowed to the Dzierżno Duże dam-reservoir by highly polluted Kłodnica River. Their considerable number decreases along with distance within the reservoir. From the Kłodnica River estuary and in the distance 700 m, the water quality is classless (coefficient of Coli - fecal type was 0.002 - 0.008). In the 1500 m distance water quality was III and II class purification. Near the Kłodnica River estuary the number of streptococci fecal-type, rod-shaped bacteria (Clostridium) and Pseudomonas aeruginosa was big (MPN 2400). The FC/FS index (fecal coliform/fecal enterococci) was 4. It is indicative of human-fecal pollution. No diversification in the number of staphylococci depending on sample point localization was recorded. The research by traditional and the latest methods did not confirm the presence of Salmonella in the water of reservoir. The investigations of staphylococci and Pseudomonas aeruginosa seem to confirm the role of zooplankton as an important element (consumption of biocenosis feeding on bacteria pressure) in the selfpurification processes. The patho-rnicrobiological pollution of the reservoir is a factor, due to recreational function of its east part of.