Xenoestrogen nonylphenol at lethal concentration 50 causes dramatic change in the haematological profile of Ophiocephalus punctatus. On short term exposure to NPanaemic conditions were found to induce in fish, which result in decrease in erythrocytes, Hb, PCV. However MCV and MCH increased. These changes can be attributed to inhibition of erythrogenesis or destruction of erythrocytes. Total leucocyte and lymphocytes count decreased indicate the potential decreased in immunity of exposed fish. It is concluded that the NP is hemotoxic in O. punctatus.
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