• Ammonium sulphate induced stress related alterations in the respiratory epithelium of the airbreathing organ of the catfishHeteropneustes fossilis (Bloch)

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    • Keywords


      Heteropneustes fossilis ; accessory respiratory organ; ammonium sulphate toxi-city; histopathology

    • Abstract


      In this paper, histopathological changes in the inner lining of the accessory respiratory organ ofHeteropneustes fossilis following exposure to sublethal concentration (0.2 g I–1) of ammonium sulphate (3 mg I–1 total ammonia-N) has been described. The goblet cells show periodic increased followed by decreased secretory activities. Necrosis and shedding of the epithelial cells over the secondary lamellae cause periodic haemorrhages which lead to degeneration and decreased number of secondary lamellae. Subsequently regeneration takes place each time as evidenced by the appearance of inflammatory tissue. Fusion of more than one secondary lamellae is also common. Regeneration also leads to uncontrolled hyperplasia of haphazardly arranged epithelial cells. This hyperplasia causes increased distance of respiratory blood-air barrier in the secondary lamellae, leading to impaired normal aerial respiration

    • Author Affiliations


      V I Paul1 T K Banerjee1

      1. Histochemistry and Histopathology Laboratory, Centre of Advanced Study in Zoology, Banaras Hindu University, Varanasi - 221005, India
    • Dates

  • Journal of Biosciences | News

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