Effect of heavy metal nickel on ultrastrcutural changes in the gill of the estuarine fish liza parsia

Effect of 10 % sublethal concentration (12.4 ppm; 96 h LC50) of nickel on the gill ultra structure of Liza parsia after the exposure period of 30 days was studied. The SEM studies revealed many morphological changes in the gill of Liza parsia such as epithelial hypertrophy, fusion of secondary lamellae, necrosis and degenerating microridges with mucous opening due to chronic exposure of the nickel.