Table 2. Experimental design.
Numbers of fish exposed to stressor treatments and associated rates of oxygen decline throughout the three phases of the experiment.
| Phase | Stressor treatment | Treatment date | Number of fish | Oxygen minimum during treatment (% saturation) | Oxygen minimum during treatment (mg/L) | Rate of oxygen decline during treatment (%/hour) | Rate of oxygen decline during treatment (%/fish/hour) |
|---|---|---|---|---|---|---|---|
| September 2015 | Crowded | 10/09/2015 | 669 | 96.81 | 7.84 | NA | NA |
| Crowded & hypoxia | 09/09/2015 | 503 | 36.86 | 2.98 | 11.4 | 0.023 | |
| Control | 11/09/2015 | * | 103.39 | 8.39 | NA | NA | |
| September 2016 | Crowded | 28/09/2016 | 951 | 87.78 | 6.88 | NA | NA |
| Hypoxia | 27/09/2016 | 1282 | 36.35 | 2.83 | 16.8 | 0.013 | |
| Crowded & hypoxia | 30/09/2016 | 1185 | 36.90 | 2.97 | 26.4 | 0.022 | |
| Control | 29/09/2016 | 1838 | 91.58 | 7.23 | NA | NA | |
| October 2016 | Crowded | 26/10/2016 | 1662 | 86.82 | 7.08 | NA | NA |
| Hypoxia | 25/10/2016 | 1230 | 38.30 | 3.33 | 8.4 | 0.007 | |
| Crowded & hypoxia | 27/10/2016 | 1795 | 38.69 | 3.30 | 39 | 0.021 | |
| Control | 24/10/2016 | 1891 | 85.49 | 7.37 | NA | NA |
* = missing echosounder data