The exposures as a function of sample time.

<p>(A) the average fish density calculated from the upward looking echo-sounder, (B) the range defined as the upper minus the lower boundary of the fish distribution within the pen detected by the echo-sounder, and (C) the dissolved oxygen saturation (%) for each treatment. Each line represents one treatment (one line in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0190259#pone.0190259.t001" target="_blank">Table 1</a>), and the colour indicates the treatment type. The time is given in hours after start of treatment. The green vertical lines represent the treatment time period.