Sixth day spa mutant phenotype (Class III). Wild-type control (A-C) and spa homozygote sibling (D-F) are shown. Melanophore number is decreased, weakly dorsally (D,E), and more strongly ventrally (arrows in D). Melanophores are abnormally shaped and many are seen as small spots (F, arrowhead) or fragmented (arrow). Xanthophores fill in gaps in the dorsal stripe, giving general yellow colouration in F (compare Fig. 6D). B,C,E and F are dorsal views, of the head and rostral trunk (B,E) or of dorsal stripe melanophores (C,F). Abbreviations as Fig. 2. Scale bars, 400 μm (A,D), 500 μm (B,E) and 125 μm (C,F).
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