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. 2021 Jul 22;9(1):coab058. doi: 10.1093/conphys/coab058

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© The Author(s) 2021. Published by Oxford University Press and the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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(A) Heart rate (f_H, bpm) and (B) the percentage change in f_H (as a % of initial values at 0 or 80 bar) in lumpfish exposed to decreasing oxygen levels (air saturation, %) in the IPOCAMP chamber over 3–4 hours. Prior to the decrease in oxygen levels, lumpfish were held at atmospheric pressure (black circles; n = 8) or exposed to 80 bar of pressure (grey circles; n = 8). An asterisk represents a significant difference in the slopes of the relationships between control and pressure-exposed lumpfish. (C) The percentage of QI₀ ECGs were provided by the Star-Oddi Mercury software, and in this panel, an asterisk represents a significant difference between pressure-exposed and control groups at a particular oxygen level. Within each treatment group, there were no differences in the quality of ECGs. Data were recorded every 5 minutes, and the symbols represent means ± S.E.M (6 values per fish).