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The present study was aimed to investigate the effects of lead on histology of gills of silver carp, Hypophthalmichthys molitrix. The fish was exposed to three doses / treatments of lead (T1=6mg/l, T2=12mg/l, T3=18mg/l) for five weeks. In trial TI, the gills showed degeneration and fusion of secondary lamellae, dilation of blood vessel, proliferation of mucous cells and infiltration of erythrocytes. In trial T2, primary lamellae had swollen tips and severe hyperplasia on lamellar epithelium. Secondary lamellae were curled and fused to form club shaped structure and lamellar blood vessels were engorged. The cyst formation was followed by lamellar fusion. Haemorrhages and complete loss of secondary lamellae and epithelial degeneration was prominent. In Trial 3, acute atrophy and hypertrophy in the secondary lamellae was most evident feature. While vacuolation and severe degeneration of the basal epithelium of primary lamellae were prominent. Severe hyperplasia, necrosis and complete loss of secondary lamellae were the most serious effects of lead toxicity on gills. This study has shown that the heavy metal even in the lowest concentration has very toxic effects on the gills of silver carp, depending on the concentration of doses applied.
Arfa Khawar , Zafar Iqbal. (2013) Histopathology of gills of silver carp, Hypophthalmichthys molitrix (valenciennes) exposed to lead , Punjab University Journal of Zoology, Volume 28, Issue 2.
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