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Fig. 3. Number of 5-HT-IR cells on the filament and lamellae in rainbow trout
(O. mykiss), trairão (H. lacerdae), traira (H.
malabaricus) and goldfish (C. auratus). Values are expressed as
means ± s.e.m. At least 50 cells per individual and six individuals per
species were measured. Letters (a–d) indicate cell counts significantly
different from columns labelled with different letters.
P50 values are given in the key as good indicators of
relative hypoxia tolerance.