its BAF value in C. Carpio muscle placed
it in the third position, first in gill and liver among the heavy metals. Pb accumulated first position in water and
muscle and fourth in gill and liver. This means that some heavy metal accumulation in fish could depend not only on
the concentration of the metal in the water column but also on the abiotic features of the environment (eg., pH,
Redox potential alkalinity and salinity), and the duration of exposure [35, 36, 37, 38].