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Table 2.

Muscle morphology of the pectoral fin at five days post fertilization

VariableMeans.e.m.
Fin area (μm256465 2021 
Muscle area (μm225590 993 
Total fin area (μm282055 2535 
Ratio fin area/muscle area 2.2 0.1 
Fin area (%) 68.8 
Muscle area (%) 31.2 
Number of extensor fibers 54.4 0.9 
Number of flexor fibers 51.8 1.6 
VariableMeans.e.m.
Fin area (μm256465 2021 
Muscle area (μm225590 993 
Total fin area (μm282055 2535 
Ratio fin area/muscle area 2.2 0.1 
Fin area (%) 68.8 
Muscle area (%) 31.2 
Number of extensor fibers 54.4 0.9 
Number of flexor fibers 51.8 1.6 

All values are given as mean of the pectoral fin musculature (N=5)of the left pectoral fin of 5 dpf fish. Fin and muscle areas calculated from lateral view projections. There is no significant difference between the number of extensor and flexor fibers (t-test, t=1.431, P=0.1902).

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