Table 2. Numbers of mackerel used in trials investigating the effect of crowding on Atlantic mackerel physiology and survival (survival, mortality and injury rates are included).
| Trial name | No. of fish prior to pre-treatment | No. of fish exposed to treatment | No. of survivorsa | Proportion of injured survivors | No. of mortalities (excl. moribund fish) | No. of moribund fish | Mortality proportion (95% CIb) |
|---|---|---|---|---|---|---|---|
| Control 1 | 149 | 149 | NA | NA | NA | NA | NA |
| Control 2 | 121 | 116 | 96 | 0.010 | 0 | 0 | 0.000 (0.000, 0.038) |
| High and prolonged 1 | 78 | 78 | NA | NA | NA | NA | NA |
| Low | 236 | 231 | 213 | 0.169 | 0 | 0 | 0.000 (0.000, 0.018) |
| High and prolonged 2 | 91 | 91 | NA | NA | NA | NA | NA |
| Control 3 | 180 | 175 | 155 | 0.013 | 0 | 0 | 0.000 (0.000, 0.024) |
| Moderate | 136 | 131 | 112 | 0.420 | 3 | 0 | 0.026 (0.009, 0.074) |
| High | 155 | 150 | 91 | 0.648 | 32 | 8 | 0.305 (0.233, 0.389) |
aRemovals for physiological sampling immediately prior to termination (‘Termination’) were classed as survivors.
bCIs were calculated using Wilson score intervals.