Oreochromis mossambicus were sampled from a semi-intensively managed polyculture earthen pond in Bagauda, Nigeria for histopathological changes in the gills and liver as early warning signs of pond water pollution. Pond water was sourced from nearby Bagauda dam through a single 28 inches water pipe. The physicochemical parameters of the earthen pond water were within acceptable limits for the growth and survival of O. mossambicus. Although observed histopathological lesions were significantly (p
Key words: Earthen pond, Histopathology, Oreochromis mossambicus, Polyculture, Semi-intensive management
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