Bioaccumulation of heavy metals (chromium, copper, nickel, cadmium, lead, and zinc) in tissues (muscles, gills, kidneys, liver) of four fish species: zander (Stizostedion lucioperca L.), perch (Perca fluviatilis L.), bream (Abramis brama L.), and roach (Rutilus rutilus L.), most important for the Wojnowskie Lakes ichthyofauna, was related to fish age, weight, and total body length. The tissue heavy metal contents were found to vary with fish age. The heavy metal bioaccumulation vs. fish age relationship was species-specific. In most cases, a negative relationship was observed. Positive correlations were recorded in zander and bream for cadmium vs. fish age and length, in bream for lead vs. age, length, and weight, and in roach for nickel vs. fish weight. In the remaining cases, statistically significant correlations between fish age and contents of the heavy metals studied were negative.

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