The hypoxic constraint on peak oxygen uptake (ṀO2peak) was characterized in rainbow trout over a range of ambient oxygen tensions with different testing protocols and statistical models. The best-fit model was selected using both statistical criteria (R2 & AIC) and the model's prediction of three anchor points for hypoxic performance: critical PO2 (Pcrit), maximum ṀO2 and a new metric, the minimum PO2 that supports 50% of absolute aerobic scope (PAAS-50). The best-fitting model was curvilinear using five strategically selected PO2 values. This model predicted PAAS-50 as 70 mm Hg (CV=9%) for rainbow trout. Thus, while a five-point hypoxic performance curve can characterize the limiting effects of hypoxia in fish, as envisioned by Fry over 75 years ago, PAAS-50 is a promising metric to compare hypoxic constraints on performance in a standardized manner both within and across fish species.
Characterizing the hypoxic performance of a fish using a new metric: PAAS-50
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- Funder(s): Natural Sciences and Engineering Research Council of Canada
- Funder(s):
Currently Viewing Accepted Manuscript - Newer Version Available
Yangfan Zhang, Daniel W. Montgomery, Connor F. White, Jeffrey G. Richards, Colin J. Brauner, Anthony P. Farrell; Characterizing the hypoxic performance of a fish using a new metric: PAAS-50. J Exp Biol 2022; jeb.244239. doi: https://doi.org/10.1242/jeb.244239
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