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Publisert 2005

Les på engelsk


Tidsskrift : Biology Letters , vol. 1 , p. 419–422–4 , 2005

Internasjonale standardnummer :
Trykt : 1744-9561
Elektronisk : 1744-957X

Publikasjonstype : Vitenskapelig artikkel

Bidragsytere : Johnston, Ian A.; Abercromby, Marguerite; Andersen, Øivind

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Kjetil Aune


Growth of fast myotomal muscle in teleosts involves the continuous production of muscle fibres until some genetically pre-determined length. The dwarf landlocked (Bleke) population of Atlantic salmon (Salmo salar L.) from Byglands-fjord, Southern Norway mature at about 25 cm fork length and reach a maximum size of only 30 cm in the wild. The maximum diameter (D-max) of fast muscle fibres in 4-year-old Bleke salmon (25-28 cm fork length) was 119 mu m and not significantly different from that found in immature migratory salmon of a similar size. In contrast no evidence for active fibre recruitment was found in the Bleke salmon, such that the maximum fibre number, FNmax, was only 21-30% of that reported in typical farmed and wild migratory populations, respectively. We hypothesise that, once established, the physiological consequences of the dwarf condition led to rapid selection for reduced fibre number, possibly to reduce the maintenance costs associated with ionic homeostasis.