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Fig. 4. Oxygen debt after air exposure in G. histrio. The values are O2 consumption (O2) in water measured during 1 h periods immediately after exposure to air for 2 h. Means ± S.E.M. of six fish. The broken line shows the mean O2 previously measured in 11 individuals not exposed to air (from Table 1). *P<0.001 compared with the 3–4 h, 4–5 h and 5–6 h values.