Abstract
Heavy metals as importantpollutants in aquatic ecosystems can cause adverse biological effects on liveorganisms of these environments. This research was conducted to study the bioaccumulationof zinc (Zn) in internal organs (mantle, gill, hepatopancreas and foot) of thefreshwater bivalve, Anodonta cygnea during 27 days in vitro exposureperiod. Results showed that this species has a high potency of metalaccumulation. There was no significant difference between basal Zn levels instudied organs. Maximum accumulation rate were recorded in gill andhepatopancreas and their Zn content was significantly (α=0.05; P < 0.02) higher than mantle and foot. The minimumZn accumulation occurred in mantle. Zn levels in gill, hepatopancreas and footwere increased during exposure period, but a decreasing trend was observed inZn level of mantle between days 18 and 27. The results of this study indicatedthat accumulation potential of different organs and their sensitivity andimpressibility are different and gill and hepatopancreas are appropriate organsto study heavy metal bioaccumulation and their pollution in freshwaters.
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