Abstract
Though air-breathing has probably evolved mainly as a response to hypoxia, it may provide an important oxygen supplement when metabolism is elevated, as for example during swimming. Due to the increased travelling distance involved when an air-breathing fish swims to and from the surface, and the increased drag when the surface is breached, it can be proposed that air-breathing results in a rise in the apparent cost of transport. In order to investigate this hypothesis, it is necessary to use a fish that is able to swim equally well with and without access to air. The striped catfish Pangasianodon hypophthalmus has been shown to have a sufficiently high capacity for aquatic oxygen uptake in normoxia, to allow for such a comparison. Here, we measured the partitioning of oxygen uptake (\( \dot{M}{\text{O}}_{2} \)) during swimming and recovery, and calculated the apparent cost of transport with and without access to air, under normoxic conditions. Aerial \( \dot{M}{\text{O}}_{2} \) constituted 25–40 % of the total \( \dot{M}{\text{O}}_{2} \) during swimming and less than 15 % during recovery. The net cost of transport was 25 % lower in fish that did not air-breathe compared to fish that did, showing that the cost of surfacing can be substantial. This is the first study to measure partitioning in an air-breathing fish during swimming at velocities close to the critical swimming speed.
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Acknowledgments
This study was performed at Can Tho University (Vietnam) and was supported by Danida [(Danida Fellowship Centre, Denmark (Grant numbers 84-08-AU, 207-AU)], the Danish Research Council, and the Faculty of Science and Technology at Aarhus University.
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Communicated by G. Heldmaier.
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Lefevre, S., Wang, T., Huong, D.T.T. et al. Partitioning of oxygen uptake and cost of surfacing during swimming in the air-breathing catfish Pangasianodon hypophthalmus . J Comp Physiol B 183, 215–221 (2013). https://doi.org/10.1007/s00360-012-0701-8
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DOI: https://doi.org/10.1007/s00360-012-0701-8