An investigation on the effect of the heavy metal, lead (Pb) on the
gill and liver of the African catfish Clarias gariepinus was
carried out in the laboratory. One hundred and sixty (160) fingerlings
of the fish were exposed to continuous exposure to sub-lethal
concentrations (0.006 mg/l and 0.008 mg/l) of lead for a period of
three weeks. The liver and gill of fish were removed every 9 days for
histological examination. The results showed that the degree of
distortion of the gills and liver was proportional to the exposure
periods and concentration of the metals was found to be dose and time
dependent