Histopathological alterations in gills of freshwater prawn, Macrobrachium dayanum (Crustacea - Decapoda) after acute and sub-acute exposure of lead nitrate

摘要: Lead is a nonessential “grey listed” heavy metal, used in fuels, ceramics, paints and glass wares industries vehicles. After taking entry aquatic ecosystem it becomes toxic cause serious problem to plants animals. Haematological, neurological, nephrological histopathological effects of lead are well known. Fresh water prawn, Macrobrachium dayanum, potential animal for freshwater aquaculture, subjected acute sub-acute concentration nitrate (116.46 mg/l; 96h LC50 29.12 25% LC50) showed severe alterations gills after 24, 48, 72 10, 20 30 day exposure. Chief during exposure were thickening gill plates, reduction inter lameller spaces, cuticular irruption, inflammation necrosis where as clumping hyperplasia, hypertrophied haemocytes with nuclear pycnosis leakage inter-lameller spaces deposition broken tissue debris near base observed The severity was found duration dependant. Present study reveals that histological bio- markers provides complete information regarding metal toxicity particularly these economically important fresh prawns, which can themselves serve bio-indicator worsening status surface bodies.