Especially with regard to the pathological
changes, the tissue damage increased in severity in a dose-dependent manner. The liver tissue of common
carp revealed different degree of hydropic degeneration, vacuolisation, pyknotic nuclei, and fatty
infiltration. The gills of common carp displayed varied degrees of epithelial hypertrophy, telangiectasis,
oedema with epithelial separation from basement membranes, general necrosis, and epithelial desquamation.
After a 20-d recovery treatment, the antioxidant enzyme activities and MDA content were significantly
lower (p < 0.05) than in the corresponding exposure groups in all of the highest doses