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Continuous measurement of oxygen tensions in the air-breathing organ of Pacific tarpon (Megalops cyprinoides) in relation to aquatic hypoxia and exercise

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dc.contributor.authorSeymour, R.
dc.contributor.authorFarrell, A.
dc.contributor.authorChristian, K.
dc.contributor.authorClark, T.
dc.contributor.authorBennett, M.
dc.contributor.authorWells, R.
dc.contributor.authorBaldwin, J.
dc.date.issued2007
dc.descriptionThe original publication can be found at www.springerlink.com
dc.description.abstractThe Pacific tarpon is an elopomorph teleost fish with an air-breathing organ (ABO) derived from a physostomous gas bladder. Oxygen partial pressure (PO(2)) in the ABO was measured on juveniles (238 g) with fiber-optic sensors during exposure to selected aquatic PO(2) and swimming speeds. At slow speed (0.65 BL s(-1)), progressive aquatic hypoxia triggered the first breath at a mean PO(2) of 8.3 kPa. Below this, opercular movements declined sharply and visibly ceased in most fish below 6 kPa. At aquatic PO(2) of 6.1 kPa and swimming slowly, mean air-breathing frequency was 0.73 min(-1), ABO PO(2) was 10.9 kPa, breath volume was 23.8 ml kg(-1), rate of oxygen uptake from the ABO was 1.19 ml kg(-1) min(-1), and oxygen uptake per breath was 2.32 ml kg(-1). At the fastest experimental speed (2.4 BL s(-1)) at 6.1 kPa, ABO oxygen uptake increased to about 1.90 ml kg(-1) min(-1), through a variable combination of breathing frequency and oxygen uptake per breath. In normoxic water, tarpon rarely breathed air and apparently closed down ABO perfusion, indicated by a drop in ABO oxygen uptake rate to about 1% of that in hypoxic water. This occurred at a wide range of ABO PO(2) (1.7-26.4 kPa), suggesting that oxygen level in the ABO was not regulated by intrinsic receptors.
dc.description.statementofresponsibilityRoger S. Seymour, Anthony P. Farrell, Keith Christian, Timothy D. Clark, Michael B. Bennett, Rufus M. G. Wells and John Baldwin
dc.identifier.citationJournal of Comparative Physiology B: biochemical, systemic, and environmental physiology, 2007; 177(5):579-587
dc.identifier.doi10.1007/s00360-007-0156-5
dc.identifier.issn0174-1578
dc.identifier.issn1432-136X
dc.identifier.orcidSeymour, R. [0000-0002-3395-0059]
dc.identifier.urihttp://hdl.handle.net/2440/44142
dc.language.isoen
dc.publisherSpringer
dc.source.urihttp://www.springerlink.com/content/90239m328x4119nx/
dc.subjectFish
dc.subjectRespiration
dc.subjectAir-breathing
dc.subjectBimodal gas exchange
dc.subjectOxygen receptors
dc.titleContinuous measurement of oxygen tensions in the air-breathing organ of Pacific tarpon (Megalops cyprinoides) in relation to aquatic hypoxia and exercise
dc.typeJournal article
pubs.publication-statusPublished

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