The use of fish – mineral concentrate (F-MC) in amount of 0% (group I – controI), 4% (group II) and 8% (group III) in mixture for fattening pigs (from 20 to 120 kg of body weight) was determined. There were statistically significant increase of dry matter and ash concentration in faeces of fattening pigs from experimental groups. The use of concentrate (F-MC) had decreasing effect on the raw protein and fibre content in excreted faeces comparing with contral group. Moreover, the concentrations of Ca and Mg were statistically significant higher and the concentrations of Cu and Zn were lower than in group I. Summarizing, it was found that F-MC concentrate had positive influence on the use of some nutrients and mineral components by fattening pigs.

33-41