“…In the present study, the highest Zn concentrations were obtained in liver, followed by the cartilage and serum. These results in agreement with those of other studies concerning the differences between trace metal concentrations in fish tissues (Allen‐Gil & Martynov, ; Gilbert et al., ; Kalisinska, Salicki, Kavetska, & Ligock, ; Papagiannis et al., ) may be explained by the fact that liver is the major organ involved in xenobiotic metabolism of most vertebrates like fish (Kittler, Hurtaud‐Pessel, Maul, Kolrep, & Fessard, ; Maradonna et al., ; Tabassum et al., ). Aquatic organisms normally bound the trace elements in their liver through cysteine‐rich proteins known as metallothioneins, the ubiquitous low molecular polypeptides which play important roles in the homeostasis, storage, transport and metabolism of essential trace metals like Zn (Do Carmo et al., ; Falfushynska et al., ; Lin et al., ).…”