Author/Authors :
Vinodhini، R نويسنده Aquatic Biodiversity Research Centre, Dept. of Advanced Zoology and Biotechnology, St.Xavier’s College (Autonomous), Palayamkottai – 627 002, Tamilnadu, India , , Narayanan، M نويسنده Aquatic Biodiversity Research Centre, Dept. of Advanced Zoology and Biotechnology, St.Xavier’s College (Autonomous), Palayamkottai – 627 002, Tamilnadu, India ,
Abstract :
The hazardous effect of heavy metals on the histopathology of selected organs of the
freshwater fish common carp (Cyprinus carpio L.) was investigated. Gill, liver, kidney and flesh
samples were collected after 32 days of exposure to a sublethal concentration of 5 mg/L of combined
(Cd + Pb + Cr + Ni) metal solution containing 1.25 mg/L of each metal ion (1/10th
of LC50 / 48h) was
analyzed by using light microscopy. The main histopathological changes observed in the gill were
edema and lifting of lamellar epithelia. The liver of control fish exhibited a normal structural pattern,
while the fish exposed to heavy metals showed vacuolation, presence of hemosiderin and fibrosis.
The findings in kidney exhibited the presence of macrophages with lipofuscin granules accumulated
in the affected cells. In flesh samples lesions and granulomas were observed. The investigation of
histological changes in organs of fish is an accurate way to assess the effects of xenobiotics
compounds in experimental studies. This investigation presents a reliable indicator of the aquatic
ecosystem contamination and the possible negative impact of the surrounding environment.
