Total Mercury Distribution in Muscular Tissue of Hypostomus affinis (Steindachner, 1877) and Hypostomus c.f. luetkini (Barlenger, 1887) from Muriaé River, Itaperuna – RJ
Resumo
With the purpose of evaluating the consumed fish quality, total mercury concentration were analyzed in muscle samples from two tropical freshwater fish (Hypostomus affinis Steindachner,1877 and Hypostomus c.f. luetkini, Barlenger,1887) from the Muriaé River, Itaperuna Municipality, in the North of Rio de Janeiro State. A secondary objective of the present study was to compare mercury concentration in these two species during dry and wet seasons. In order to achieve these goals, five organisms from each species were monthly collected between August 2005 and January 2006. H. affinis always presented lower total mercury average concentration when compared with H. c.f. luetkini with exception of August 2005 when an opposite trend was observed. The highest mercury concentrations were observed in October for both species (H. affinis 33.4 ng.g–1 in wet weight and H. c.f. luetkini 39.5 ng.g–1 in wet weight) during the beginning of dry season. There was a clear trend of higher Hg concentrations during the dry season when compared to the wet season probably related with the dilution effect caused by the increasing water discharges during the wet season. All analyzed samples presented total mercury concentrations lower than the maximum permitted concentration for human consumption established by ANVISA and WHO (500 ng.g–1 in wet weight), therefore no risk for human consumption was observed.
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