Figure 4: a and b: Light micrographs. Gills of group 6 (50 ppm nitrite). a) Showing marked histological alterations and severe deformations with severe irregular and curled secondary lamellae, extensive hypertrophy (HT) leading to severe lamellar fusion (FU) of secondary lamellae with severe blood infiltration (I). b) Revealing remarkable and widespread tissue damage and lysis at several points (►►) with severe telangiectasia (►) and infiltration of blood cells (I). [Formalin fixed- H&E stained preparation, X 400].
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