Fig. 2. Similar stripes with different melanophore numbers and colors in D. rerio and D. nigrofasciatus juveniles. (A,B) D. rerio; (C,D) D. nigrofasciatus. (A) The ventral primary melanophore stripe of D. rerio consists of numerous gray-black metamorphic melanophores (arrow). Melanophores persisting from embryonic stages at the site of the early larval ventral melanophore stripe (arrowhead) are browner than metamorphic melanophores. (B) In the D. rerio dorsal primary melanophore stripe, a few melanophores at the ventral edge are brown in color (arrowhead), where a few melanophores are derived from the early larval stripe pattern. (A',B') Schematics of fish shown in A and B, showing black and brown melanophores. No attempt is made to precisely delineate individual melanophore boundaries. (C) Unlike in D. rerio, the ventral primary melanophore stripe of D. nigrofasciatus includes numerous brown melanophores (arrowhead), in addition to black melanophores (arrow). (D) Detail showing D. nigrofasciatus brown melanophores (arrowhead) and black melanophores in the ventral primary melanophore stripe. (C',D') Schematics of fish shown in C and D.