The early-eyed embryo
(stage 7; Fig. 1F) is pigmented light
brown, first at the dorsoanterior margin
and subsequently throughout the
retina. Melanophores are undetectable
on the head or trunk at this
stage. During the early-eyed period,
pigmentation of the eye, including the
choroid, gradually increases, the pectoral
fin buds emerge, and somitic as
well as nonsomitic muscles differentiate.