The fine structure of muscle fibres of roach, <i>Rutilus rutilus</i> (L.), and chub, <i>Leuciscus cephalus</i> (L.), Cyprinidae, Teleostei: interspecific differences and effects of habitat and season

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<jats:p>Red and white axial muscle fibres from roach and chub were investigated by electron microscopy. Fish from three different localities were compared. Qualitative and quantitative analysis of myofibrils, mitochondria, lipid and subsarcolemmal cytoplasm with regard to muscle fibre type, species, season and habitat were made. Muscle fibre types differ significantly with the exception of the subsarcolemmal cytoplasm in roach. Within‐species lipid content of red fibres differs between seasons. However, the most marked effect on red muscle fibres within species and season as regards volume density of lipid and mitochondria can be attributed to the different localities. The results are discussed in relation to mode of life and differences in habitat.</jats:p>

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