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Oxygen transport capacity in the air-breathing fish, Megalops cyprinoides: compensations for strenuous exercise

Wells, R. M. G., Baldwin, J., Seymour, R. S., Baudinette, R. V., Christian, Keith A. and Bennett, M. B. (2003). Oxygen transport capacity in the air-breathing fish, Megalops cyprinoides: compensations for strenuous exercise. Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology,134(1):45-53.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 14 times in Scopus Article | Citations

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Title Oxygen transport capacity in the air-breathing fish, Megalops cyprinoides: compensations for strenuous exercise
Author Wells, R. M. G.
Baldwin, J.
Seymour, R. S.
Baudinette, R. V.
Christian, Keith A.
Bennett, M. B.
Journal Name Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology
Publication Date 2003
Volume Number 134
Issue Number 1
ISSN 1531-4332   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-0037223387
Start Page 45
End Page 53
Total Pages 9
Place of Publication New York, US
Publisher Elsevier Science
Field of Research 0606 - Physiology
0608 - Zoology
1116 - Medical Physiology
HERDC Category C1 - Journal Article (DEST)
Abstract Tarpon have high resting or routine hematocrits (Hct) (37.6+/-3.4%) and hemoglobin concentrations (120.6+/-7.3 gl-1) that increased significantly following bouts of angling-induced exercise (51.9+/-3.7% and 142.8+/-13.5 gl-1, respectively). Strenuous exercise was accompanied by an approximately tenfold increase in blood lactate and a muscle metabolite profile indicative of a high energy demand teleost. Routine blood values were quickly restored only when this facultative air-breathing fish was given access to atmospheric air. In vitro studies of oxygen transport capacity, a function of carrying capacity and viscosity, revealed that the optimal Hct range corresponded to that observed in fish under routine behaviour. During strenuous exercise however, further increase in viscosity was largely offset by a pronounced reduction in the shear-dependence of blood which conformed closely to an ideal Newtonian fluid. The mechanism for this behaviour of the erythrocytes appears to involve the activation of surface adrenergic receptors because pre-treatment with propranolol abolished the response. High levels of activity in tarpon living in hypoxic habitats are therefore supported by an elevated Hct with adrenergically mediated viscosity reduction, and air-breathing behaviour that enables rapid metabolic recovery.
DOI http://dx.doi.org/10.1016/S1095-6433(02)00179-4   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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