Gill lesions associated with acute exposure to ammonia.
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The histopathological effects of the 96 hr LC50 at 20.65 ppm NH3-N on the gills of milkfish fingerlings were examined qualitatively. Lesions observed were hypertrophy, hyperplasia, fusion of the lamellae, epithelial lifting, lamellar telangiectasis, disruption of the epithelial layer, lamellar detachment, vacuolation of the lamellae and the blood cells, and presence of several mitotic cells. The physiology of the histopathological lesions observed is discussed.