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Table 3.

Maximum cardiovascular parameters in hearts of `wild' and hatchery-reared Oncorhynchus mykiss

GroupRelative ventricular mass (%) (ml min-1 kg-1fish) (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 
GroupRelative ventricular mass (%) (ml min-1 kg-1fish) (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 

, cardiac output; VS stroke volume.

No significant differences were found between groups, with the exception of (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 This difference was probably related to the number of mature males in this group (5 of 8) (A. K. Gamperl et al.,unpublished).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.

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