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Oxygen removal from water versus arterial oxygen delivery: calibrating the Fick equation in Pacific salmon


Farrell, AP and Eliason, EJ and Clark, TD and Steinhausen, MF, Oxygen removal from water versus arterial oxygen delivery: calibrating the Fick equation in Pacific salmon, Journal of Comparative Physiology. B, 184, (7) pp. 855-864. ISSN 0174-1578 (2014) [Refereed Article]

DOI: doi:10.1007/s00360-014-0839-7


While it is well known that O2 is directly removed from the water by skin and gill tissues of fish, the mismatch between O2 removal from water (O2 uptake; VO2) and the O2 delivered to tissues by the primary circulation (O2 consumption; VaO2) has never been measured directly. Using data from four recent studies that simultaneously measured VO2 and VaO2 in 25 kg Pacific salmon, our analysis revealed that sockeye salmon can remove an additional 1248 % more O2 from the water than the primary circulation delivers to the systemic tissues. This percentage did not change significantly during swimming activity, a result that contradicts an earlier prediction that the difference should decrease when VO2 increases during exercise. In resting Chinook salmon, a similar percentage difference in simultaneously measured VO2 and VO2 was observed, yet the difference tended to disappear during acute heat stress to a near lethal temperature. These results emphasize that caution should be exercised when using the Fick equation to estimate cardiac output because the overestimate of cardiac output that results from using the Fick equation in Pacific salmon is not small, may not be fixed and may exist in other teleosts.

Item Details

Item Type:Refereed Article
Keywords:temperature, blood, cardiac output, hematocrit, hemoglobin, cutaneous oxygen consumption, branchial oxygen consumption, branchial-cutaneous oxygen consumption, skin, gills, secondary circulation, plasma skimming
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal behaviour
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Coastal or estuarine biodiversity
UTAS Author:Clark, TD (Dr Timothy Clark)
ID Code:103343
Year Published:2014
Web of Science® Times Cited:12
Deposited By:IMAS Research and Education Centre
Deposited On:2015-10-06
Last Modified:2018-03-19

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