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Fig. 3. Changes in (A) protruding lamellar surface area, (B) water–blood
diffusion distance, and (C) filament epithelial thickness in the gills of the
scaleless carp during exposure to hypoxia (0.3 mg O2
l–1) for 24 h followed by recovery in normoxia for 12 h.
*A statistically significant difference from the normoxic control
values. Vertical bars about the mean represent s.e.m. (N=7).