Pikeperch (Sander lucioperca) is a marine and freshwater fish known for its predatory and carnivorous nature. It is a significant component of the diet for communities residing near the Caspian Sea and occupies the top level of the food chain, feeding on other fish and crustaceans. Numerous sources around the Caspian Sea discharge waste into the rivers, leading to pollution, including mercury chloride. Bioaccumulation in higher trophic levels is more pronounced, posing a risk to pikeperch. This study, conducted in 2008, explored the acute toxicity and bioaccumulation of mercuric chloride in juvenile pikeperch weighing 1.5±0.5 grams. Fish were exposed to various chemical concentrations in 20-liter tanks with 20 fish each. Six treatments with three replications and a control were performed using the static OECD method over four days to determine lethal concentrations (LC5096h). Water parameters such as pH, dissolved oxygen, total hardness, and temperature were monitored, with average values recorded as pH 8, total hardness 250 mg/l, temperature 25±1°C, and dissolved oxygen 7.5±0.5 mg/l. Results indicated LC5096h and LC5024h values for mercury chloride at 0.091 and 0.072 mg Hg/l, respectively. Bioaccumulation in muscle tissue, kidney, and gill after 24h were 1.72, 17.8, and 24.6 mg Hg/l, respectively, and after 96h were 3.2, 18.1, and 28.2 mg Hg/l. Bioconcentration values in tissues exceeded those in water.

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