Maximum cardiovascular parameters in hearts of `wild' and hatchery-reared Oncorhynchus mykiss
| Group . | Relative ventricular mass (%) . | Q̇ (ml min-1 kg-1fish) . | Q̇ (ml min-1 g-1ventricle) . | VS (ml min-1 g-1 ventricle) . | Power output (mW g-1 ventricle) . |
|---|---|---|---|---|---|
| Wild steelhead (N=8) | 0.094±0.003 | 68.6±3.4a | 73.2±3.2 | 1.02±0.05 | 7.34±0.19 |
| Sea-ranched steelhead (N=8) | 0.102±0.005 | 69.3±3.3a | 68.0±3.1 | 0.97±0.04 | 7.16±0.21 |
| Oregon Hatchery rainbows (N=6) | 0.101±0.005 | 77.7±2.8ab | 76.6±3.4 | 1.08±0.06 | 7.00±0.27 |
| Washington Hatchery rainbows (N=8) | 0.107±0.006 | 81.3±3.9b | 76.9±5.0 | 1.08±0.05 | 7.43±0.45 |
| Group . | Relative ventricular mass (%) . | Q̇ (ml min-1 kg-1fish) . | Q̇ (ml min-1 g-1ventricle) . | VS (ml min-1 g-1 ventricle) . | Power output (mW g-1 ventricle) . |
|---|---|---|---|---|---|
| Wild steelhead (N=8) | 0.094±0.003 | 68.6±3.4a | 73.2±3.2 | 1.02±0.05 | 7.34±0.19 |
| Sea-ranched steelhead (N=8) | 0.102±0.005 | 69.3±3.3a | 68.0±3.1 | 0.97±0.04 | 7.16±0.21 |
| Oregon Hatchery rainbows (N=6) | 0.101±0.005 | 77.7±2.8ab | 76.6±3.4 | 1.08±0.06 | 7.00±0.27 |
| Washington Hatchery rainbows (N=8) | 0.107±0.006 | 81.3±3.9b | 76.9±5.0 | 1.08±0.05 | 7.43±0.45 |
Q̇, cardiac output; VS stroke volume.
No significant differences were found between groups, with the exception of Q̇ (ml min-1 kg-1)for Washington Hatchery-reared rainbows. This difference was probably related to the number of mature males in this group (5 of 8) (A. K. Gamperl et al.,unpublished). Dissimilar letters indicate a significant difference as determined by one-way ANOVA.