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Oxygen removal from water versus arterial oxygen delivery: calibrating the Fick equation in Pacific salmon
journal contribution
posted on 2023-05-18, 13:20 authored by Farrell, AP, Eliason, EJ, Clark, TD, Steinhausen, MFWhile 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; V·O2) and the O2 delivered to tissues by the primary circulation (O2 consumption; V·aO2) has never been measured directly. Using data from four recent studies that simultaneously measured V·O2 and V·aO2 in 2–5 kg Pacific salmon, our analysis revealed that sockeye salmon can remove an additional 12–48 % 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 V·O2 increases during exercise. In resting Chinook salmon, a similar percentage difference in simultaneously measured V·O2 and V·O2 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.
History
Publication title
Journal of Comparative Physiology. BVolume
184Issue
7Pagination
855-864ISSN
0174-1578Department/School
Institute for Marine and Antarctic StudiesPublisher
Springer-VerlagPlace of publication
175 Fifth Ave, New York, USA, Ny, 10010Repository Status
- Restricted