Loss of muscle fibres in a landlocked dwarf Atlantic salmon population

I A Johnston, M Abercromby, O Andersen

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)419-422
Number of pages4
JournalBiology Letters
Volume1
Issue number4
DOIs
Publication statusPublished - 22 Dec 2005

Keywords

  • dwarfism
  • body size evolution
  • Salmonidae
  • skeletal muscle
  • growth
  • muscle fibre recruitment
  • RAPID EVOLUTION
  • SEAWATER STAGES
  • SALAR
  • NUMBER
  • PLASTICITY
  • GROWTH

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