Pikeperch (Sander lucioperca) is one of the marine and freshwater fish and it is a predator and carnivores. The fish is one of the commercial fishes and it is the people‘s diet who live near the Caspian Sea. The fish is at the top level of food chain and it feeds the other fishes and crustaceans. There are a lot of sources around the Caspian Sea that dump their waste in the rivers flowing in the Sea. Mercury chloride is one of the water pollutants which also exist in the waste of these sources, without being controlled are dumped in the rivers. Bio accumulation in the higher levels of food chains is more effective than the lower levels and the fish in the Caspian Sea is in the highest level. The impact of mercury chloride on the fingerlings of pikeperch was studied in 2008. The determination of the acute toxicity and bioaccumulation of mercuric chloride in pikeperch Juveniles weighting 1.5±0.5 grams. The fish were exposed to various chemical concentrations in water. The tests were done in 20 liter tanks each containing 20 fish. We carried out six treatments with three replications and a control for each of the chemicals using the static O.E.C.D. method, and investigate four days, through which the lethal concentration (LC5096h) were studied. During the test physiochemical parameters of water such as, pH, dissolved oxygen, total hardness and temperature were measured. The average pH was recorded as 8, total hardness 250 mg/lit, average water temperature was 25±1 degree centigrade and dissolved oxygen was 7.5±0.5 mg/lit. The result showed that LC5096h and LC5024h of mercury chloride (HgCl2) on pikeperch were 0.091 and 0.072 mg Hg/lit respectively. The bioaccumulation values during 24h in muscle tissue, kidney and gill were 1.72 , 17.8 and 24.6 mg Hg/lit respectively. The exposure of the values during 96h were 3.2, 18.1 and 28.2 mg Hg/lit in tissue, kidney and gill respectively. The bioconcentration values for muscle tissue, kidney and gill were higher than the ones in water. \n\nKey word: Pikeperch (sander lucioperca), LC50, HgCl2, Bioaccumulation.

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