Alterations in the Gill Filaments and Secondary Lamellae of Cirrhinus mrigala Exposed to “Nuvan,” an Organophosphorus Insecticide

Figure 4

(a) Average thickness of gill filament epithelium (μm; mean ± SD) of C. mrigala at different intervals. 0 h: prior to exposure to “Nuvan”; 4 h–4 d: intervals of exposure to 5 mg/L and 15 mg/L of “Nuvan”; 2 dr–16 dr: intervals of recovery after 4 d exposure to “Nuvan.” h: hour; d: day; dr: day of recovery; mg/L: milligram/liter; and asterisks “” on bars indicate significant difference from control (). . (b) Average thickness of secondary lamellae epithelium (μm; mean ± SD) of C. mrigala at different intervals. 0 h: prior to exposure to “Nuvan”; 4 h–4 d: intervals of exposure to 5 mg/L and 15 mg/L of “Nuvan”; 2 dr–16 dr: intervals of recovery after 4 d exposure to “Nuvan.” h: hour; d: day; dr: day of recovery; mg/L: milligram/liter; and asterisks “” on bars indicate significant difference from control (). .

(a)

(b)