The experiments were carried out in carp ponds supplied with biologically pre-treated municipal sewage. 30 000 m³ of sewage per day supplied 40.1 ha of ponds, stocked with one-year old carp fingerling wit mean body mass of 19.11-20.21 g ind^-1. The aim of the experiment was to determine of the production potential in ponds practical conditions of „Komorowice” sewage treatment plant, collecting the sewage from the town Bielsko-Biała. Under various stocking density of carp (1 750, 3 500 and 5 250 ind. ha^-1), the total yield varied from 1 280 to 2 319 kg of fish per 1 hectare, with survival rate 76-90% and final mean individual weight from 372 to 474 g ind^-1. Thanks mathematical formula based on empirical data, the theoretical optimal stocking density was calculated as 7 000 individuals of carp fingerling per one hectare.

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