Colour Variation
There are 'transparent' scale variants of bitterlings, though not common, if exploited in the aquarium trade.
For photos of transparent variants of bitterlings, please see: http://www.jstage.jst.go.jp/article/zsj/15/3/425/_pdf
Read more about this topic: Amur Bitterling
Famous quotes containing the word colour:
“The purest and most thoughtful minds are those which love colour the most.”
—John Ruskin (1819–1900)