Accumulation Variations of selected heavy metals in Barbus xanthopterus in Karoon and Dez Rivers of Khuzestan, Iran



concentrations of Cd, Pb, Ni and Hg were
determined in gill, liver and muscle of Barbus xanthopterus in down streams of Karoon and Dez Rivers
during summer 2009. Heavy metal concentrations
varied significantly, depending on the types of the tissue in fish species. The
levels of heavy metals such as Cd, Pb, Ni and Hg in the Barbus xanthopterus
of Karoon River were higher than in Barbus xanthopterus of Dez River (P < 0.05). In Karoon and Dez Rivers, the concentrations of
Cd, Pb and Ni were in the sequence gill>liver>muscle.
The concentration of Hg in Karoon River was in the
sequence liver> gill> muscle but,
in Dez River, it was in the sequence liver> muscle > gill. Among
heavy metals (Cd, Pb, Ni and Hg), the accumulation of Pb was more
than other heavy metals in fish (P < 0.05). In both rivers, the accumulation of
heavy metals in muscle of fish was higher than the world health organization
(WHO) standard.