Relationship between swimming speed and rate of oxygen uptake in seven Gymnotus carapo submitted to a critical swimming speed protocol in aquatic normoxia.

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Relationship between swimming speed and rate of oxygen uptake in seven Gymnotus carapo submitted to a critical swimming speed protocol in aquatic normoxia (∼18 kPa PO2) with (A) or without (B) access to atmospheric air, or in aquatic hypoxia (4 kPa PO2) with (C) or without (D) access to air. Relationship between swimming speed and rate of oxygen uptake in seven Gymnotus carapo submitted to a critical swimming speed protocol in aquatic normoxia (∼18 kPa PO2) with (A) or without (B) access to atmospheric air, or in aquatic hypoxia (4 kPa PO2) with (C) or without (D) access to air. On each panel, each symbol represents the same individual fish; the matching coloured (or dotted) line is a least-squares exponential regression fitted to that individual’s data points. Individual regression coefficients are given in supplementary material Table S1. David J. McKenzie et al. J Exp Biol 2012;215:1323-1330 © 2012.