Resumen del producto

Mercury and selenium concentrations in sharks were determined in the muscle and liver tissues of silky shark Carcharchinus falciformis and Smooth hammerhead Sphyrna zygaena caught off Todos Santos , Southern Baja California, Mexico during August – December, 2014. The average mercury concentrations presented values of [(µg g^-1) muscle: 3.04; liver: 3.95] in C. falciformis; whereas  in S. zygaena (muscle: 5.23; liver: 3.39) exceeding its limit of (1.0 µg g^-1) established by the Mexican government.   The biomagnification factors (BMF) to understand the prey-predator relations, were also calculated and it was observed that all BMF´s were greater than 1, indicating absolute biomagnification of Hg.  Surplus Se concentrations (µg g^-1) were found in the muscle (2.76) and liver (6.12) tissues, resulting in a molar excess of Se over Hg, denoting a rich source of Se. Our results prove to offer the basic strategies of the biogeochemical processes of Hg-Se in marine sharks.

Palabras clave: shark; Hg & Se; Liver & muscle; Biomagnification; Southern Baja California South, Mexico.

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