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Fig. 2. General view of the scaleless carp gill filaments viewed by light
microscopy (LM) in fish exposed to normoxia (control; A), following exposure
to 0.3 mg O2 l–1 hypoxia for 12 h (B), 24 h (C),
and following 12 h recovery in normoxia (D). Note that in A, the filament is
thick and there is an interlamellar mass, in B and C there is a thinning of
the filament and lamellar epithelium, and protrusion of the lamellae. In D,
there is a thickening of the filament and lamellae, with the reappearance of
the interlamellar mass. Scale bars, 20 µm.