Oral presentation Accumulation of cadmium in Cyprinus carpio tissues following exposure to low concentration of cadmium (mean concentration reported from inland water in Iran) Ghiasi F.*, Mirzargar S.S. ,Salaramoli J. Department of Fisheries Sciences ,Faculty of Agriculture and natural Resources ,University of Kurdistan , Iran Email : FGH@uok.ac.ir Fish accumulated cadmium from polluted environment resulting in accumulation in their tissues. Common carp have the ability to accumulate and concentrate cadmium to levels several orders of magnitude above those found in their environment. The study was undertaken to show comparative accumulation of cadmium in different organs of carp after 15 and 30 days exposure to sub-lethal concentration of cadmium . The experiment were carried out with 80 fish were obtained from local fish farm. Fish were randomly distributed in two indoor fiberglass tanks supplied with well water. Half of were use as a control group while the second group exposed to 30 ppb (30µg l-1) cadmium (Mean concentration reported from inland water in Iran) as CdCl2 (Merck) for 30 days. Fifteen fish were removed from each tank at the days15 and 30 post exposure and organ samples including kidney, gill, liver and spleen were provided. Water quality parameter and the level of cadmium in water was measured two times weekly throughout the exposure. The cadmium accumulation in different organs were monitored using atomic absorption spectrophotometer (SHIMATZU AA -670 G), t test was used to compare data among organs. The present study shows that the rate of cadmium accumulation after 15days exposure (30µg l-1) was in the order spleen > kidney > gill> liver . After 30 days exposure the cadmium concentration in kidney and gill was about 2 fold higher than in liver and about 4 fold higher than in spleen. At the day 30 post exposure cadmium content in spleen significantly (p≤٪5) was lesser than other organs. The cadmium accumulation was in the order gill ≈ kidney> liver
