Abstract
The present study was aimed to examine the morphological, behavioral changes and histopathological
changes in the liver of Nile tilapia, Oreochromis niloticus after acute exposure to methylmercury. The toxicity
of methylmercury of Nile tilapia was studied in a static renewal bioassay for 48 hours and 96 hours (96
hours L.C-50 0.22 mg/L). The study was conducted on 40 fish that were divided into 4 groups A, B, C and
D. Group A was considered as control group. Group B, C and D were exposed to sublethal concentrations
of methylmercury 0.044 mg/L, 0.055 mg/ L and 0.073 mg/L in tap water respectively. The fish exhibited
tail and fin disruption, bulging of eyes, scales erosion, mucous secretion, hemorrhage, color change, slow
down swimming, lake of balance, restlessness, swimming side-wise, retardation of opercular movement
and quick sudden movements. The fish was anesthetized and liver were removed after 48 and 96 hours for
histopathological studies. The histopathological changes observed in liver were degeneration of hemopoietic
tissue, destruction of hepatocytes, degeneration of bile duct, inflammatory infiltration, vacuolization, pyknosis,
presence of MMCs and necrosis in hepatocytes. It can be concluded that methylmercury has harmful effects
on histology of liver of fish. Therefore, the present work suggests that the exposure to the methylmercury
should be prevented to avoid injurious health hazard risks to fish.
Aqsa Pervaiz, Hira Pervaiz, Rukhshanda Afridi, Zahra Pervaiz , Rabia Masood. (2019) Examination of Morphological, Behavioral and Histopathological Effects on Oreochromis niloticus after Acute Exposure to Methylmercury, Journal of Innovative Sciences, VOLUME 5, ISSUE 1.
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