Fig. 5. (A) The distribution of fibre diameters in the fast myotomal muscle for 46 dwarf benthic morphs ranging in size from 3.7 cm to 27.1 cm FL. Smooth nonparametric distributions were fitted to measurements of a minimum of 1000 fibre diameters per fish using a kernel function (see text for details). The insert shows the detail of the left-hand side of the distribution. The probability density functions of fish containing fibres in the 4–10 µm size category are shown in black (broken lines). Fish with no fibres in this size category that were considered to have stopped recruiting fibres are shown in red. The blue broken lines represent the largest fish examined (27.1 cm FL). (B) A diagrammatic representation of the entire data set showing the presence (closed circles) and absence (open circles) of muscle fast fibres less than 10 µm in relation to fish fork length for the dwarf benthic (DB), large benthic (LB), planktivorous (PL) and piscivorous (PI) morphs.