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Figure 3


Fig. 3. (A) Decrease in oxygen tensions (mmHg) over time as nitrogen is bubbled into a glass tank. Oxygen tensions were measured every 5 min in each vertical zone (see key) within the tank and there was no significant zonation of oxygen tension within the tank (P=0.771). (B) The oxygen tension at the time of surfacing of large (open bar) and small oscar (hatched bar). The asterisk indicates a significant difference (t=2.14, P=0.02, N=8); values are means ± s.e.m. The insert shows the correlation between mass of individual fish (g) and the oxygen tension at time of surfacing (P=0.04; r2=0.207).





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