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Fig. 1. General view of the scaleless carp gill filaments using scanning electron
microscopy (SEM) 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, gill filaments
bear short lamellae, in B there is an increase in height and basal length of
lamellae, which are accentuated in C, and in D there is a reduction in height
and basal length of lamellae relative to C. L, lamella; TE, trailing
(afferent) edge of filament. Scale bars, 300 µm.