Figure 1.

(a) Bleke dwarf-Atlantic salmon (Salmo salar L.). (b) Distribution of muscle fibre size in Bleke salmon and a Scottish farmed salmon population of the same average body length. The dashed line is the average probability density function (PDF) for the farmed salmon, the solid line is the average PDF for the Bleke salmon, and the dotted line is the average PDF for the combined populations. Shaded area represents 100 bootstrap estimates of the combined populations of fibre diameter. Note the absence of the smallest size class of fibres in Bleke salmon indicating the absence of active muscle fibre recruitment. The inset shows the percentage of fibres <10 μm diameter.