We analysed 4 fish species - bream, roach, perch and Gustera blicca bjorkna. It involved the determination of heavy metal content in their tissues, nanol: Cd, Cu, Zn, Pb in muscles, liver and bronchia. The table shows the results including arithmetic mean, SD and extreme values of metal in each tissue. The findings can reflect the contamination degree of the fish in the waters in Wrocław. The comparison of metal levels in time function was made and it is presented in diagrams by regression lines.