Specialisations of swimming muscles in the pelagic antarctic fish Pleuragramma antarcticum |
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| Authors: | I A Johnston J -P Camm M White |
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| Institution: | (1) Gatty Marine Laboratory, Department of Biology and Preclinical Medicine, University of St. Andrews, KY16 8LB St. Andrews, Fife, Scotland;(2) British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, CB3 OET Cambridge, England |
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| Abstract: | The distribution and ultrastructure of muscle-fibre types has been investigated in adult and juvenile specimens of the pelagic high-antarctic silverfish Pleuragramma antarcticum Boulenger, 1902 collected from the South Shetland Islands during the winter of 1984/1985. Two main fibre-types were identified in araldite-embedded material. The axial musculature was mainly composed of poorly vascularised, largediameter muscle fibres which were densely packed with myofibrils (volume density 81 and 72% for adults and juveniles, respectively). These ultrastructural characteristics are typical of fast-twitch fibres. The number of capillaries ner unit cross-sectional area and the volume density of mito |
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