The economical and industrial aspects of aquatic organisms like fish make the topic of toxicants important. The present study was carried out to measure the accumulation of heavy metals (Pb, Sn and Zn) in the liver and muscle of pike (Esox lucius). Totally, 60 pikes have been collected from 6 stations in the Anzali wetland (the south coast of the Caspian Sea) included Pirbazar, Anzali, Abkenar, Sa...... hiện toàn bộ