Abstract
Abstract White and red axial muscle fibres of the grey mullet were studied by electron microscopy and morphometry. No significant difference was found between white and red fibers in their percentage of sarcoplasmic reticulum and T system, in location of triads and also in myofibril organization. However, red fibres were found to be richer in mitochondria and energy reserves than white fibres and this supports the view that these two fibre types play different roles in swimming locomotion.
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