Resting and post-stress plasma cortisol and catecholamine levels in GH transgenic and control Atlantic salmon
| . | . | Control . | Transgenic . | Trans/Con ratio . | P value . |
|---|---|---|---|---|---|
| Cortisol (ng ml-1) | Rest | 12.1±1.7 | 11.6±2.3 | 0.95 | 0.86 |
| Stress | 24.7±2.3† | 17.8±1.3† | 0.72 | 0.02* | |
| Epinephrine (nmol l-1) | Rest | 3.3±0.6 | 5.8±1.7 | 1.76 | 0.17 |
| Stress | 12.3±2.1† | 20.6±2.8† | 1.67 | 0.03* | |
| Norepinephrine (nmol l-1) | Rest | 1.7±0.3 | 4.3±0.8 | 2.53 | 0.02* |
| Stress | 5.0±0.8† | 8.9±0.7† | 1.78 | 0.004* | |
| Total catecholamines (nmol l-1) | Rest | 4.9±0.9 | 10.2±2.1 | 2.08 | 0.04* |
| Stress | 17.4±2.9† | 29.6±3.4† | 1.70 | 0.02* |
| . | . | Control . | Transgenic . | Trans/Con ratio . | P value . |
|---|---|---|---|---|---|
| Cortisol (ng ml-1) | Rest | 12.1±1.7 | 11.6±2.3 | 0.95 | 0.86 |
| Stress | 24.7±2.3† | 17.8±1.3† | 0.72 | 0.02* | |
| Epinephrine (nmol l-1) | Rest | 3.3±0.6 | 5.8±1.7 | 1.76 | 0.17 |
| Stress | 12.3±2.1† | 20.6±2.8† | 1.67 | 0.03* | |
| Norepinephrine (nmol l-1) | Rest | 1.7±0.3 | 4.3±0.8 | 2.53 | 0.02* |
| Stress | 5.0±0.8† | 8.9±0.7† | 1.78 | 0.004* | |
| Total catecholamines (nmol l-1) | Rest | 4.9±0.9 | 10.2±2.1 | 2.08 | 0.04* |
| Stress | 17.4±2.9† | 29.6±3.4† | 1.70 | 0.02* |
Resting measurements were taken 48 h after cannulation and black box confinement. Post-stress catecholamine levels were measured immediately after a 45 s net stress, whereas post-stress cortisol levels were assessed 30 min later.
Values are means ± 1 standard error (N=8).
Significant difference (P<0.05) between transgenic and control salmon; †significant difference (P<0.05) between resting and stressed fish.