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Chronic experimental hyperoxia elevates aerobic scope: a valid method to test for physiological oxygen limitations in

Michael R Skeeles1, Hanna Scheuffele1, Timothy D Clark1

  • 1School of Life and Environmental Sciences, Deakin University, Geelong, Victoria, Australia.

Journal of Fish Biology
|September 7, 2022
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Summary

Long-term exposure to higher oxygen levels (hyperoxia) significantly boosts fish aerobic performance. This sustained benefit suggests hyperoxia acclimation can help study climate warming impacts on fish populations.

Keywords:
acclimation effectgill-oxygen limitation theorymetabolic rateoxygen supersaturationoxygen- and capacity-limited thermal tolerance

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Area of Science:

  • Physiological Ecology
  • Aquatic Biology
  • Climate Change Research

Background:

  • Experimental hyperoxia can acutely enhance fish oxygen uptake, but long-term effects are unknown.
  • Understanding chronic hyperoxia benefits is crucial for its use in climate warming studies.
  • Fish populations may face oxygen-related challenges due to climate warming.

Purpose of the Study:

  • To determine if experimental hyperoxia benefits to oxygen uptake capacity persist under chronic conditions.
  • To assess the long-term effects of hyperoxia acclimation on fish aerobic metabolic performance.
  • To evaluate hyperoxia as a tool for investigating climate warming impacts on fish.

Main Methods:

  • Measuring aerobic metabolic performance of Galaxias maculatus.
  • Exposing fish to acute hyperoxia (150% air saturation) and chronic hyperoxia for 5 months.
  • Conducting experiments at two temperatures (15°C and 20°C).

Main Results:

  • Acute hyperoxia increased aerobic scope by 74%-94%.
  • A 58%-73% elevation in aerobic scope persisted after 5 months of hyperoxia acclimation.
  • Hyperoxia-acclimated fish maintained superior aerobic performance even when returned to normoxia.

Conclusions:

  • Experimental hyperoxia provides long-term benefits to fish aerobic performance.
  • Hyperoxia acclimation appears to induce lasting physiological or metabolic adjustments.
  • This study supports the use of chronic hyperoxia to study oxygen's role in fish responses to climate warming.