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This analysis shows good intentions in the selection of valid and precise oxygen uptake (   M  ˙   O 2 ) measurements by retaining only slopes of declining dissolved oxygen level in a respirometer that have very high values of the coefficient of determination,  r  2 , are not always successful at excluding nonlinear slopes. Much worse, by potentially removing linear slopes that have low  r  2  only because of a low signal‐to‐noise ratio, this procedure can overestimate the calculation of standard metabolic rate (SMR) of the fish. To remedy this possibility, a few simple diagnostic tools are demonstrated to assess the appropriateness of a given minimum acceptable  r  2 , such as calculating the proportion of rejected    M  ˙   O 2  determinations, producing a histogram of the  r  2  values and a plot of  r  2  as a function of    M  ˙   O 2 . The authors offer solutions for cases when many linear slopes have low  r  2 . The least satisfactory but easiest to implement is lowering the minimum acceptable  r  2 . More satisfactory solutions involve processing (smoothing) the raw signal of dissolved oxygen as a function of time to improve the signal‐to‐noise ratio and the  r  2 s.

Valid oxygen uptake measurements: using high r 2 values with good intentions can bias upward the determination of standard metabolic rate