Abstract
The aim of this study was to determine the 96-h LC50 (lethal concentration for 50% of the test population in 96h of observation) of mercury chloride (HgCl2) andevaluated its absorption in the gills, liver, and muscle of juvenile "curimatã-pacu," Prochilodus argenteus. The fish were exposed for 4days to differentconcentrations of HgCl2: 0.000, 0.0375, 00.075, 0.150, 0.225, 0.300, and 0.400mg L-1 to get the 96-h LC50, and the concentration of Hg in the tissues. The fish were exposed to different levels of HgCl2 (0.000, 0.0375, 00.075, 0.150, 0.225, and 0.300mg L-1), for 4 and 7days, when different tissues (gills, liver, and muscle) were sampled. The mercury concentration values obtained were compared between tissues, days, and concentration of mercury in the water. The 96-h LC50 for P. argenteus was 0.339mg L-1 of HgCl2, within the range found for other neotropical and tropical species, showing a medium sensitivity. The concentration of Hg in the tissues increased from the muscle to the gills and liver, and according to the increasing concentration of HgCl2 in the water. The fish liver is the most suitable tissue for environmental monitoring and for the evaluation of the consumed fished. Despite being the tissue that least accumulated mercury, the muscle must be evaluated because it is the part consumed by the population.
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