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Total mercury (Hg) concentrations were determined by CV-AAS in selected tissues (liver, kidney, and muscle) of the Great Cormorant and some fish species (herring, ruffe, European smelt, tench, roach, Crucian carp, and Prussian carp) from the Vistula Lagoon ecosystem (Poland). Significant correlations between Hg concentrations in the kidneys and muscle of cormorants (U test, p&lt;0.05) were found; levels of the metal were highest in the birds' liver and kidneys. Total Hg concentrations in the fish decreased in the following order: roach &gt; Prussian carp &gt; Crucian carp &gt; tench &gt; European smelt &gt; ruffe &gt; herring. The biomagnification factor of Hg for the cormorant relative to the fish decreased in the following sequence: herring &gt; ruffe &gt; European smelt &gt; tench &gt; Crucian carp &gt; roach = Prussian carp. It was significantly greater than unity, especially for the cormorant-herring trophic relationship. This implies that Hg is biomagnified in the cormorant in relation to its prey.

Biomagnification of mercury in trophic relation of Great Cormorant (Phalacrocorax carbo) and fish in the Vistula Lagoon, Poland