Induced Histopathological Alterations in Selected Organs of Rutilus kutum exposed to polluted waters in Anzali Lagoon

Anzali wetland has ecological importance since it hosts migratory birds and fishes in southwest Caspian Sea. Based on researches performed, Trace elements such as Lithium (Li), Barium (Ba), Strontium (Sr), Arsenic (As), cadmium (Cd), Cobalt (Co), Chromium (Cr), copper (Cu),Molybdenum (Mo), Nickel (Ni), lead (Pb), and Sulfur (S) in addition to petroleum compounds such as Polycyclic Aromatic Hydrocarbons (PAHs) are considered as the ubiquitous pollutants in Anzali wetland which their concentration is increasing there and can be a great hazard for wetland inhabitants. Our study assessed the effects of these pollutants on one of the most significant fish species living through the wetland, Rutilus kutum. In order to perform the study, ninety fries were exposed to polluted water from Abkenar area and Siahkishim part of the Anzali lagoon (in the form of 3 treatments and 3 replications). After first day of exposure no obvious effect on epithelial cells of gill lamellas were detected,but in liver cells some cases of cytoplasm and nucleous degeneration were detedted, while after 4 days anomalies such as disorganization in primary and secondary lamella; lamellar fusion and club shaped lamellas in gill samples and bile stagnation in liver cells were detected(P>0.05). Then 8 days of exposure resulted severe signs of alteration like lumen expansion and blood congestion in primary lamella in gill tissues and focal necrosis in liver tissues (P