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Figure 3


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.