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Photomicrographs (2 mm) of the H&E-stained gill tissue of C. carpio (A) Control group showing regular shaped GF gill filament and GL lamellae, (B) Acute exposure, (C–G) Sublethal exposure of CQ. LF, lamellar fusion; DN degenerative and necrotic changes in the epithelium of gill filaments; OE edema; V vacualization; HP hyperplasia; BC blood congestion; EL epithelial lifting; HT hypertrophy; F fusion; C Curling; DQ desquamated were found in the CQ exposed fingerlings.
