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Table 1.

Morphometric parameters obtained from the ventricles of small and large eels (Anguilla anguilla L.)

Morphometric parametersSmall eel (N=6)Large eel (N=6)
Lacunary spaces (% of section surface) 63.25±0.7 28.03±2.23*** 
Myocardium (% of section surface) 36.74±0.55 71.96±4.52*** 
Compacta   
   Thickness (mm) 0.0977±0.0019 0.9927±0.0166*** 
   Vessels (number mm-2986.84±62.6 1692.8±73.97*** 
   Vessels [diameter (mm)] 0.0059±0.00008 0.009±0.00026*** 
   Myocardium (% of section surface) 7.07±0.56 11.06±1 
   Vessels (% of section surface) 70.49±2.08 76.92±1.8 
   Interstitium (% of section surface) 22.44±2.01 12.02±1.29 
   Myocardium/vessels ratio 9.98 6.95** 
   Cell number (number/0.01 mm2215.7±22.8 377.6±20.3*** 
   Cellular cross-section (μm237.25±1.08 18.3±0.302*** 
   Myofibril (% of cell surface) 16.5±2.36 11.65±1.43* 
   Mitochondria (number in each cell) 10±1.87 17±1.34* 
   Mitochondria size (μm20.174±0.017 0.107±0.006*** 
   Mitochondria (% of cell surface) 4.7±0.8 9.91±1.78** 
Spongiosa   
   Trabecular diameter (mm) 0.03±0.00097 0.04±0.0013*** 
   Myocardium (% of section surface) 73.52±3.81 78.91±1.9 
   Interstitium (% of section surface) 26.48±3.81 21.09±1.97 
   Cell number (number/0.01 mm2174.8±8.2 196.6±11.4* 
   Cellular cross-section (μm229±0.56 25±0.48*** 
   Myofibril (% of cell surface) 24.06±3.79 5.81±0.44** 
   Mitochondria (number in each cell) 13.2±2.17 15±1.5 
   Mitochondria size (μm20.209±0.016 0.197±0.0087 
   Mitochondria (% of cell surface) 9.43±1.61 10.26±1.4 
Morphometric parametersSmall eel (N=6)Large eel (N=6)
Lacunary spaces (% of section surface) 63.25±0.7 28.03±2.23*** 
Myocardium (% of section surface) 36.74±0.55 71.96±4.52*** 
Compacta   
   Thickness (mm) 0.0977±0.0019 0.9927±0.0166*** 
   Vessels (number mm-2986.84±62.6 1692.8±73.97*** 
   Vessels [diameter (mm)] 0.0059±0.00008 0.009±0.00026*** 
   Myocardium (% of section surface) 7.07±0.56 11.06±1 
   Vessels (% of section surface) 70.49±2.08 76.92±1.8 
   Interstitium (% of section surface) 22.44±2.01 12.02±1.29 
   Myocardium/vessels ratio 9.98 6.95** 
   Cell number (number/0.01 mm2215.7±22.8 377.6±20.3*** 
   Cellular cross-section (μm237.25±1.08 18.3±0.302*** 
   Myofibril (% of cell surface) 16.5±2.36 11.65±1.43* 
   Mitochondria (number in each cell) 10±1.87 17±1.34* 
   Mitochondria size (μm20.174±0.017 0.107±0.006*** 
   Mitochondria (% of cell surface) 4.7±0.8 9.91±1.78** 
Spongiosa   
   Trabecular diameter (mm) 0.03±0.00097 0.04±0.0013*** 
   Myocardium (% of section surface) 73.52±3.81 78.91±1.9 
   Interstitium (% of section surface) 26.48±3.81 21.09±1.97 
   Cell number (number/0.01 mm2174.8±8.2 196.6±11.4* 
   Cellular cross-section (μm229±0.56 25±0.48*** 
   Myofibril (% of cell surface) 24.06±3.79 5.81±0.44** 
   Mitochondria (number in each cell) 13.2±2.17 15±1.5 
   Mitochondria size (μm20.209±0.016 0.197±0.0087 
   Mitochondria (% of cell surface) 9.43±1.61 10.26±1.4 

Morphometric parameters were measured on light and transmission EM (TEM)images (256 grey values).

Values are means ± s.e.m. of 12 determinations in triplicate for each animal. The compacta thickness was calculated on 12 images for each animal and the values represent the means ± s.e.m.of 10 measurements for each image. Statistical significance of the differences was assessed using the paired Student's t-test(***P<0.0005; **P<0.005; *P<0.05).

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