Studies on the swimming musculature of the rainbow trout I. Fibre types

A histochemical study has been made on the myotomal musculature of the rainbow trout Salmo gairdneri Richardson. Four main types of fibre can be distinguished on the basis of differences in fibre size, lipid content and succinic dehydrogenase and myofibrillar adenosine triphosphatase activity (A TPase activity). Early histological studies have concluded that in addition to a superficial strip of muscle small diameter. red' fibres occur throughout the trout myotome. These small diameter fibres occurring in the bulk of the myotome are shown to differ from the superficial fibres with respect to their oxidative metabolism and myofibrillar A TPase. The relevance of this finding to studies on the energetics and swimmin!t efficiency of this species are discussed. I. INTRODUCnON . The myotome of most teleost fish is composed of distinct red and white muscles. The red muscle forms a thin sheet lying just underneath the lateral line, and runs from behind the head to the caudal fin. Red fibres are known to have high concentrations of myoglobin, cytochromes and lipids (George, 1962; Matsuura &

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