Open Access
Table 2
Number, exposure, and occurrence of mortality and injuries in yellow– and silver-phase American eel exposed to rapid decompression simulating hydroturbine passage. Percentages represent the portion of exposed fish that were recorded with the designated injury or observation.
| Yellow-phase | Silver-phase | |||||
|---|---|---|---|---|---|---|
| Exposure | ||||||
| Nadir (kPa) median (range) | 2.4 (1.2–8.1) | 2.7 (1.6–8.4) | ||||
| RPC median (range) | 10.2 (3.1–21.4) | 9.3 (3.0–16.1) | ||||
| n | 105 | 108 | ||||
| Control | 4 | 18 | ||||
| Exposed | 101 | 90 | ||||
| Instantaneous mortality | 0 | 0 | ||||
| Injured | 11 (10.9%) | 12 (13.3%) | ||||
| Swim bladder rupture | 6 (5.9%) | 0 | ||||
| Emboli | ||||||
| Heart | 0 | 1 (1.1%) | ||||
| Hemorrhaging | ||||||
| Intestinal | 1 (1.0%) | 0 | ||||
| Liver | 0 | 4 (4.4%) | ||||
| Heart | 0 | 1 (1.1%) | ||||
| Swim bladder | 3 (3.0%) | 1 (1.1%) | ||||
| Pectoral fin | 3 (3.0%) | 1 (1.1%) | ||||
| Anal fin | 0 | 3 (3.3%) | ||||
| Dorsal fin | 0 | 1 (1.1%) | ||||
| Hematoma | ||||||
| Liver | 1 (1.0%) | 1 (1.1%) | ||||
| Ruptured gall bladder | 0 | 5 (5.6%) | ||||
| Intestinal volvulus | 1 (1.0%) | 0 | ||||
| Burst capillaries along kidney wall | 1 (1.0%) | 0 | ||||
| Parasites | 52 (49.5%)* | 98 (90.7%)* | ||||
| Expelled gas during decompression | 45 (45.0%) | 64 (71.1%) | ||||
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