Etude des métaux traces (Cd, pb, hg) dans la chair des poissons des fermes aquacoles Tunisiennes

Abstract

A quaculture has seen a significant development in tunisia and farms have tried to improve and increase their production. however this could have adverse consequences affecting the ecological balance of the ecosystems and also the human health. the aim of this work is to evaluate levels of toxic traces metals cadmium (cd), lead (pb) and mercury (hg) in the muscle of two fish species: sea bream (sparus aurata) and sea bass (dicentrarchus labrax) from aquaculture farms in the north east region of tunisia during the period 2014/2015. the metal concentrations in both sampled species are determined by atomic absorption spectrophotometry with graphite furnace and dma-80. results show significant variations for pb and hg between studied farms. the cd concentrations in tissues did not differ between species and fish farms with an average 0.040±0.002 μg/g fw. bioaccumulation of trace metals analyzed depends on the availability of these metals in the ecosystem; the contamination remains dependent on several environmental factors. it is noteworthy that the concentrations of the three metals found in muscle in all fish samples are lower than the limits established by tunisian legislation for fish destined for human consumption.