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Effectiveness of the Air Stripping in Two Salmonid Fish, Rainbow Trout Oncorhynchus Mykiss and Brown Trout Salmo Trutta Morpha fario
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An unusually high upper thermal acclimation potential for rainbow trout.

Olivia A Adams1, Yangfan Zhang2, Matthew H Gilbert1

  • 1Department of Zoology, The University of British Columbia, Vancouver, British Columbia, Canada.

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Australian H-strain rainbow trout show high thermal acclimation potential, crucial for survival in a warming climate. This strain

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aerobic capacitydigestiongrowthheart ratehypoxiastanding variation

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Area of Science:

  • * Physiology and adaptation of aquatic organisms.
  • * Environmental science and climate change impacts on fish.

Background:

  • * Thermal acclimation is vital for species survival, especially with global warming.
  • * Rainbow trout (Oncorhynchus mykiss) cardiorespiratory phenotypes are crucial for understanding thermal tolerance.

Purpose of the Study:

  • * To assess the thermal acclimation potential of an Australian H-strain of rainbow trout.
  • * To test if this strain exhibits higher thermal acclimation than other rainbow trout populations.

Main Methods:

  • * Field study in Western Australia measuring growth, feed conversion, and oxygen uptake (ṀO2) at six acclimation temperatures (15°C–25°C).
  • * Assessment of specific dynamic action, critical maximum temperature (CTmax), and electrocardiographic responses to warming.
  • * Generation of thermal performance curves for the H-strain.

Main Results:

  • * Appreciable growth and aerobic capacity observed up to 23°C, with significant declines at 25°C.
  • * Upper thermal limits for appetite and feed conversion correlated with reduced heart rate increase and higher digestion costs.
  • * Heart rate limitations during warming occurred below CTmax, indicating CTmax is not a reliable predictor of cardiac oxygen delivery capacity.

Conclusions:

  • * The Australian H-strain exhibits remarkable thermal acclimation potential, likely due to selective inbreeding and genetic variation.
  • * Intra-specific genetic variation can confer significant thermal acclimation, a factor to consider in global warming impact predictions.
  • * Findings offer hope for rainbow trout conservation and inform broader fish species adaptation strategies.