Family and Population Differences in Muscle Fibre Recruitment in Farmed Atlantic Salmon (Salmo salar)
نویسندگان
چکیده
The number of muscle fibres recruited to reach a given body weight in Atlantic salmon (Salmo salar L.) showed significant variation between two strains with different growth rates and life history characteristics. Patterns of fibre recruitment also varied between twoyear classes of the same strain grown under different production conditions. The maximum diameter of fast muscle fibres was around 240 μm in all cases. The density of muscle fibres decreased with increasing body weight, although average values were relatively constant for fish of 3.5 to 6.5 kg. The variation in muscle fibre density within a family, often 65 to 140 fibres mm muscle, was significantly greater than that between families and/or strains. The significance of this variation in fibre recruitment for the textural and processing characteristics of the flesh is discussed.
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