[Super Kindai]

Hi Mike.

the temporary camouflage of baby sumi would be a wisdom of the nature in order to hide/protect themselves from predators such as birds.
it is commonly known that an albino akame kigoi, for example, which bred by mutation would not has a chance to survive in wild nature.

According to the research by the Niigata Prefecture Inland Water Fisheries Experiment Station,
a changing black color on skin surface is occurred by the activity of the chromatophore (= special cell of melanin) and the activity of the cell is leaded/reflected by a light from eyes, by water temperature, by hormone, etc.

Sumi looks fad away, when the cell shrink/tighten. Sumi looks up & stable on surface of skin, when the cell spread/diffusion.
don't know a reason but somehow sumi is unstable at young age, as we know.

On the other hand, a gene is called "Leucism" http://en.wikipedia.org/wiki/Leucism has been working in bloodline of Nishikigoi from an original Asagi-magoi to Asagi then Kohkau, for example.
Sumi is too tricky to understand very well for me.....