Age and diet-specific trace element accumulation patterns in different tissues of chub (Squalius cephalus): Juveniles are useful bioindicators of recent pollution

•Three different feeding groups of chub from the River Szamos were analyzed.•Feeding groups were differed based on the trace element patterns of tissue.•Generally, the highest concentrations of elements were found in the juveniles.•Only the hepatic copper concentrations showed positive correlation with fish age.•The juveniles of chub can be used as a bioindicators of the recent metal pollution.