Abstract
The present study is conducted and assessed the toxicity of Parthenium hysterophorus is on locally available fresh water fish. The present study deals with to determine histological effects on fresh water fish, Labeo rohita. The fishes were collected from nearby water body and brought to the laboratory for determination of histological parameters up to 96hr. period. The muscles of fish exposed lethal concentration for different time exposure (24hrs. 48hrs. 72hrs. and 96hrs.) showed lesion, inflammation, pigment and necrosis of primary and secondary gill lamellae during low concentration while, increasing concentration for different time exposure showed necrosis, malignancy and cellular degeneration were seen at later time of exposure.
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